NELLCOR PURITAN BENNETT INC
8-A12G/A, 1996-03-14
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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<PAGE>   1
================================================================================


                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                 ---------------

                                   FORM 8-A/A

              AMENDMENT NO.2 TO REGISTRATION STATEMENT ON FORM 8-A
                FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                    PURSUANT TO SECTION 12(b) OR 12(g) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                                 ---------------

                      NELLCOR PURITAN BENNETT INCORPORATED
             (Exact name of registrant as specified in its charter)

             Delaware                                   94-2789249
(State of incorporation or organization) (I.R.S. employer identification number)

       4280 Hacienda Drive
      Pleasanton, California                                          94588
(Address of principal executive offices)                           (Zip code)

         If this Form relates to the registration of a class of debt securities
and is effective upon filing pursuant to General Instruction A(c)(1), please
check the following box. / /

         If this Form relates to the registration of a class of debt securities
and is to become effective simultaneously with the effectiveness of a concurrent
registration statement under the Securities Act of 1933 pursuant to General
Instruction A(c)(2), please check the following box. / /

Securities to be registered pursuant to Section 12(b) of the Act:

      None                                                Not Applicable
(Title of each class                             (Name of each exchange on which
to be so registered)                             each class is to be registered)

Securities to be registered pursuant to Section 12(g) of the Act:

                         Preferred Share Purchase Rights
                                (Title of Class)

================================================================================

                                                               Page 1 of 6 pages
<PAGE>   2
ITEM 1:  DESCRIPTION OF REGISTRANT'S SECURITIES TO BE REGISTERED.

         On June 11 1991, the Board of Directors of Nellcor Puritan Bennett
Incorporated (formerly Nellcor Incorporated) (the "Company") declared a dividend
of one preferred share purchase right (a "Right") for each outstanding share of
common stock, par value $.001 per share (the "Common Shares"), of the Company
pursuant to the terms of a Rights Agreement dated June 11, 1991. The dividend
was paid on June 26, 1991 (the "Record Date") to the stockholders of record on
that date. Rights have also been issued with respect to each Common Share issued
or delivered after the Record Date. The Rights Agreement was first amended as of
September 1, 1992 with The First National Bank of Boston becoming the Rights
Agent (the "Rights Agent") and the Rights Agreement as so amended is referred to
as the "Original Rights Agreement." On March 8, 1996, the Company and the Rights
Agent entered into the Amended and Restated Rights Agreement (the "Amended
Rights Agreement"). The following is a summary description of the terms of the
Amended Rights Agreement.

         Each Right entitles the registered holder to purchase from the Company
one one-hundredth of a share of Series A Junior Participating Preferred Stock,
par value $.001 per share (the "Preferred Shares"), of the Company at a price of
$320 per one one-hundredth of a Preferred Share (the "Purchase Price"), subject
to adjustment. Initially, the Rights are evidenced by the stock certificates
representing the Common Shares, and no separate Rights certificates have been or
will be distributed until the earlier to occur of (i) 10 days following a public
announcement that a person or group of affiliated or associated persons (an
"Acquiring Person") have acquired beneficial ownership of 15% or more of the
outstanding Common Shares or (ii) 10 business days (or such later date as may be
determined by action of the Board of Directors prior to such time as any person
or group of affiliated persons becomes an Acquiring Person) following the
commencement of, or announcement of an intention to make, a tender offer or
exchange offer the consummation of which would result in the beneficial
ownership by a person or group of 15% or more of the outstanding Common Shares
(the earlier of such dates being called the "Distribution Date").

         The Amended Rights Agreement provides that, until the Distribution Date
(or earlier redemption, exchange or expiration of the Rights), the Rights will
be transferred with and only with the Common Shares. Until the Distribution Date
(or earlier redemption, exchange or expiration of the Rights), new Common Share
certificates issued after the Record Date upon transfer or new issuance of
Common Shares have contained and will contain a notation incorporating the
current version of the Rights Agreement by reference. Until the Distribution
Date (or earlier redemption, exchange or expiration of the Rights) the surrender
for transfer of any certificates for Common Shares outstanding as of the Record
Date, even without such notation or a copy of this or other Summary of Rights
being attached thereto, will also constitute the transfer of the Rights
associated with the Common Shares represented by such certificate. As soon as
practicable following the Distribution Date, separate certificates evidencing
the Rights ("Right Certificates") will be mailed to holders of record of the
Common Shares as of the close of 

                                                               Page 2 of 6 pages
<PAGE>   3
business on the Distribution Date, and such separate Right Certificates alone
will evidence the Rights.

         Pursuant to the Amended Rights Agreement, the Rights will expire on
March 8, 2006 (the "Final Expiration Date"), unless the Final Expiration Date is
extended or unless the Rights are earlier redeemed or exchanged by the Company,
in each case, as described below.

         The Rights are not exercisable until the Distribution Date and
thereafter are exercisable for a period of 60 days; provided, that the Rights
are not exercisable if a person becomes an Acquiring Person pursuant to a tender
or exchange offer for all outstanding Common Shares at a price and on terms
determined by the Board of Directors (including a majority of the incumbent
Board) to be fair to the stockholders of the Company after taking into account
all factors deemed relevant and otherwise in the best interest of the Company
and its stockholders. In addition, the Rights are not exercisable until the
Company's right of redemption (as described below) has expired.

         The Purchase Price payable, and the number of Preferred Shares or other
securities or property issuable, upon exercise of the Rights are subject to
adjustment from time to time to prevent dilution (i) in the event of a stock
dividend on, or a subdivision, combination or reclassification of the Preferred
Shares, (ii) upon the grant to holders of the Preferred Shares of certain rights
or warrants to subscribe for or purchase Preferred Shares at a price, or
securities convertible into Preferred Shares with a conversion price, less than
the then-current market price of the Preferred Shares or (iii) upon the
distribution to holders of the Preferred Shares of evidences of indebtedness or
assets (excluding regular periodic cash dividends paid out of earnings or
retained earnings or dividends payable in Preferred Shares) or of subscription
rights or warrants (other than those referred to above).

         The number of outstanding Rights and the number of one one-hundredths
of a Preferred Share issuable upon exercise of each Right are also subject to
adjustment in the event of a stock split of the Common Shares or a stock
dividend on the Common Shares payable in Common Shares or subdivisions,
consolidations or combinations of the Common Shares occurring, in any such case,
prior to the Distribution Date.

         Preferred Shares purchasable upon exercise of the Rights will not be
redeemable. Each Preferred Share will be entitled to a minimum preferential
quarterly dividend payment of $1.00 per share but will be entitled to an
aggregate dividend of 100 times the dividend declared per Common Share. In the
event of liquidation, the holders of the Preferred Shares will be entitled to a
minimum preferential liquidation payment of $100 per share but will be entitled
to an aggregate payment of 100 times the payment made per Common Share. Each
Preferred Share will have 100 votes, voting together with the Common Shares.
Finally, in the event of any merger, consolidation or other transaction in which
Common Shares are exchanged, each Preferred Share will be entitled to receive
100 times the amount received per Common Share. These rights are protected by

                                                               Page 3 of 6 pages
<PAGE>   4
customary anti-dilution provisions. Because of the nature of the Preferred
Shares' dividend, liquidation and voting rights, the value of the one
one-hundredth interest in a Preferred Share purchasable upon exercise of each
Right should approximate the value of one Common Share. The Preferred Shares
rank junior to all other series of the Company's preferred stock.

         In the event that the Company is acquired in a merger or other business
combination transaction or 50% or more of its consolidated assets or earning
power is sold, proper provision will be made so that each holder of a Right will
thereafter have the right to receive, upon the exercise thereof at the then
current exercise price of the Right, that number of shares of common stock of
the acquiring company which at the time of such transaction will have a market
value of two times the exercise price of the Right. In the event that any person
or group of affiliated or associated persons becomes an Acquiring Person, proper
provision shall be made so that each holder of a Right, other than Rights
beneficially owned by the Acquiring Person (which will thereafter be void), will
thereafter have the right to receive upon exercise that number of Common Shares
having a market value of two times the exercise price of the Right (or, if such
number of Common Shares is not authorized, the Company may issue cash, debt,
stock or a combination thereof in exchange for the Rights).

         At any time after any Person becomes an Acquiring Person and prior to
the acquisition by such person or group of 50% or more of the outstanding Common
Shares, the Board of Directors of the Company may exchange the Rights (other
than Rights owned by such person or group which will have become void), in whole
or in part, at an exchange ratio of one Common Share, or one one-hundredth of a
Preferred Share (or of a share of a class or series of the Company's preferred
stock having equivalent rights, preferences and privileges or the Company may
issue cash, debt or other property or any combination thereof), per Right
(subject to adjustment).

         With certain exceptions, no adjustment in the Purchase Price will be
required until cumulative adjustments require an adjustment of at least 1% in
such Purchase Price. No fractional Preferred Shares will be issued (other than
fractions which are integral multiples of one one-hundredth of a Preferred
Share, which may, at the election of the Company, be evidenced by depositary
receipts) and in lieu thereof, an adjustment in cash will be made based on the
market price of the Preferred Shares on the last trading day prior to the date
of exercise.

         At any time until ten days following the date on which a person becomes
an Acquiring Person, the Board of Directors of the Company may redeem the Rights
in whole, but not in part, at a price of $0.01 per Right. Under certain
circumstances, the decision to redeem shall require the concurrence of a
majority of the Incumbent Board. The redemption of the Rights may be made
effective at such time and upon such conditions as the Board of Directors in its
sole discretion may establish. Immediately upon any redemption of the Rights,
the right to exercise the Rights will terminate and the only right of the
holders of Rights will be to receive the redemption price.

                                                               Page 4 of 6 pages
<PAGE>   5
         The terms of the Rights may be amended by the Board of Directors of the
Company without the consent of the holders of the Rights, including an amendment
to lower the 15% beneficial ownership threshold described above with respect to
an Acquiring Person to any percentage which is (i) greater than the largest
percentage of the outstanding Common Shares then known to the Company to be
beneficially owned by any person or group of affiliated or associated persons
(other than the Company, any Subsidiary of the Company, employee benefit plans
of the Company or any Subsidiary, or any entity holding Common Shares pursuant
to the terms of any such plan) and (ii) not less than 10%, except that from and
after such time as any person or group of affiliated or associated persons
becomes an Acquiring Person, no amendment may adversely affect the interests of
the holders of the Rights (other than an Acquiring Person). After a Person
becomes an Acquiring Person and under certain other circumstances, amendments to
the Amended Rights Agreement require the concurrence of a majority of the
Incumbent Board.

         Until a Right is exercised, the holder thereof, as such, will have no
rights as a stockholder of the Company, including, without limitation, the right
to vote or to receive dividends.

ITEM 2.  EXHIBITS.

         Number                       Description

          1.1      Specimen Right Certificate

          2.1      Amended and Restated Rights Agreement, dated as of March 8, 
                   1996, between the Registrant and The First National Bank of 
                   Boston, as Rights Agent

                                                               Page 5 of 6 pages
<PAGE>   6
                                    SIGNATURE

         Pursuant to the requirements of Section 12 of the Securities Exchange
Act of 1934, the Resistrant has duly caused this Amendment No. 2 to its
Registration Statement to be signed on its behalf by the undersigned, thereto
duly authorized.

Date:  March 13, 1996               NELLCOR PURITAN BENNETT
                                    INCORPORATED

                                    By  /s/ Laureen DeBuono
                                      ----------------------------------------  
                                      Laureen DeBuono
                                      Executive Vice President, Human Resources,
                                        General Counsel and Secretary


                                                               Page 6 of 6 pages
<PAGE>   7
                              INDEX TO EXHIBITS


<TABLE>
<CAPTION>
                                                          Sequentially
Exhibit                                                     Numbered
  No.                      Description                    Page Number
- -------                    -----------                    ------------
<S>            <C>                                        <C>
  1.1          Specimen Right Certificate

  2.1          Amended and Restated Rights Agreement,
               dated as of March 8, 1996, between the
               Registrant and the First National Bank
               of Boston, as Rights Agent
</TABLE>

<PAGE>   1
                                                                     Exhibit 1.1

                            FORM OF RIGHT CERTIFICATE


Certificate No. R-                                                   ____ Rights


             NOT EXERCISABLE AFTER MARCH 8, 2006 OR EARLIER IF REDEMPTION OR
             EXCHANGE OCCURS. THE RIGHTS ARE SUBJECT TO REDEMPTION AT $.001 PER
             RIGHT AND TO EXCHANGE ON THE TERMS SET FORTH IN THE RIGHTS
             AGREEMENT.

                                Right Certificate

                      NELLCOR PURITAN BENNETT INCORPORATED

         This certifies that _______________ or registered assigns, is the
registered owner of the number of Rights set forth above, each of which entitles
the owner thereof, subject to the terms, provisions and conditions of the Rights
Agreement, dated as of June 11, 1991, as amended on September 1, 1992, and as
amended and restated on March 8, 1996, and as such agreement may be further
amended from time to time (the "Rights Agreement"), between Nellcor Puritan
Bennett Incorporated, a Delaware corporation (the "Company), and The First
National Bank of Boston (the "Rights Agent"), to purchase from the Company at
any time after the Distribution Date (as such term is defined in the Rights
Agreement) and prior to 5:00 P.M., Boston time, on March 8, 2006 at the office
of the Rights Agent designated for such purpose, or at the office of its
successor as Rights Agent, one one-hundredth of a fully paid non-assessable
share of Series A Junior Participating Preferred Stock, par value $.001 per
share (the "Preferred Shares"), of the Company, at a purchase price of $320 per
one one-hundredth of a Preferred Share (the "Purchase Price"), upon presentation
and surrender of this Right Certificate with the Form of Election to Purchase
duly executed.

         As provided in the Rights Agreement, the Purchase Price and the number
of one one-hundredths of a Preferred Share which may be purchased upon the
exercise of the Rights evidenced by this Right Certificate are subject to
modification and adjustment upon the happening of certain events.

         This Right Certificate is subject to all of the terms, provisions and
conditions of the Rights Agreement, as amended from time to time, which terms,
provisions and conditions are hereby incorporated herein by reference and made a
part hereof and to which Rights Agreement reference is hereby made for a full
description of the rights, limitations of rights, obligations, duties and
immunities hereunder of the Rights Agent, the Company and the holders of the
Right Certificates. Copies of the Rights Agreement are on file at the principal
executive offices of the Company and the above-mentioned offices of the Rights
Agent.
<PAGE>   2
         This Right Certificate, with or without other Right Certificates, upon
surrender at the office of the Rights Agent designated for such purpose, may be
exchanged for another Right Certificate or Right Certificates of like tenor and
date evidencing Rights entitling the holder to purchase a like aggregate number
of Preferred Shares as the Rights evidenced by the Right Certificate or Right
Certificates surrendered shall have entitled such holder to purchase. If this
Right Certificate shall be exercised in part, the holder shall be entitled to
receive upon surrender hereof another Right Certificate or Right Certificates
for the number of whole Rights not exercised.

         Subject to the provisions of the Rights Agreement, the Rights evidenced
by this Right Certificate (i) may be redeemed by the Company at a redemption
price of $.001 per Right or (ii) may be exchanged in whole or in part for shares
of the Company's Common Stock or Preferred Shares, par value $.001 per share.

         No fractional Preferred Shares will be issued upon the exercise of any
Right or Rights evidenced hereby (other than fractions which are integral
multiples of one one-hundredth of a Preferred Share, which may, at the election
of the Company, be evidenced by depositary receipts), but in lieu thereof a cash
payment will be made, as provided in the Rights Agreement.

         No holder of this Right Certificate, as such, shall be entitled to vote
or receive dividends or be deemed for any purpose the holder of the Preferred
Shares or of any other securities of the Company which may at any time be
issuable on the exercise hereof, nor shall anything contained in the Rights
Agreement or herein be construed to confer upon the holder hereof, as such, any
of the rights of a stockholder of the Company or any right to vote for the
election of directors or upon any matter submitted to stockholders at any
meeting thereof, or to give or withhold consent to any corporate action, or to
receive notice of meetings or other actions affecting stockholders (except as
provided in the Rights Agreement), or to receive dividends or subscription
rights, or otherwise, until the Right or Rights evidenced by this Right
Certificate shall have been exercised as provided in the Rights Agreement.
<PAGE>   3
          This Right Certificate shall not be valid or obligatory for any
purpose until it shall have been countersigned by the Rights Agent.

          WITNESS the facsimile signature of the proper officers of the Company
and its corporate seal. Dated as of _________________.

ATTEST:                                        NELLCOR PURITAN BENNETT
                                               INCORPORATED

___________________________________            By_______________________________


Countersigned:

THE FIRST NATIONAL BANK OF BOSTON
as Rights Agent

By_________________________________
         Authorized Signature
<PAGE>   4
                    Form of Reverse Side of Right Certificate


                               FORM OF ASSIGNMENT

                (To be executed by the registered holder if such
               holder desires to transfer the Right Certificate.)

         FOR VALUE RECEIVED ________________________ hereby sells, assigns and
transfers unto

            _____________________________________________

            _____________________________________________

            _____________________________________________
            (Please print name and address of transferee)

this Right Certificate, together with all right, title and interest therein, and
does hereby irrevocably constitute and appoint __________________ Attorney, to
transfer the within Right Certificate on the books of the within-named Company,
with full power of substitution.

Dated:______________________________

                                                  ______________________________
                                                  Signature


Signature Guaranteed:

         Signatures must be guaranteed by a member firm of a registered national
securities exchange, a member of the National Association of Securities Dealers,
Inc., or a commercial bank or trust company having an office or correspondent in
the United States.

                               __________________

         The undersigned hereby certifies that the Rights evidenced by this
Right Certificate are not beneficially owned by an Acquiring Person or an
Affiliate or Associate thereof (as defined in the Rights Agreement).


                                                  ______________________________
                                                  Signature
<PAGE>   5
              Form of Reverse Side of Right Certificate (continued)

                          FORM OF ELECTION TO PURCHASE

                  (To be executed if holder desires to exercise
                  Rights represented by the Right Certificate.)

To NELLCOR PURITAN BENNETT INCORPORATED

         The undersigned hereby irrevocably elects to exercise _________________
Rights represented by this Right Certificate to purchase the Preferred Shares
issuable upon the exercise of such Rights and requests that certificates for
such Preferred Shares be issued in the name of:

Please insert social security
or other identifying number:  __________

            ____________________________________________

            ____________________________________________

            ____________________________________________
            (Please print name and address of transferee)

         If such number of Rights shall not be all the Rights evidenced by this
Right Certificate, a new Right Certificate for the balance remaining of such
Rights shall be registered in the name of and delivered to:

Please insert social security
or other identifying number:  __________

            ____________________________________________

            ____________________________________________

            ____________________________________________
            (Please print name and address of transferee)


Dated:_______________________

                                                         _______________________
                                                         Signature


Signature Guaranteed:
<PAGE>   6
         Signatures must be guaranteed by a member firm of a registered national
securities exchange, a member of the National Association of Securities Dealers,
Inc., or a commercial bank or trust company having an office or correspondent in
the United States.

                              ____________________

         The undersigned hereby certifies that the Rights evidenced by this
Right Certificate are not beneficially owned by an Acquiring Person or an
Affiliate or Associate thereof (as defined in the Rights Agreement).

                                                         _______________________
                                                         Signature

                              ____________________



                                     NOTICE

         The signature in the Form of Assignment or Form of Election to
Purchase, as the case may be, must conform to the name as written upon the face
of this Right Certificate in every particular, without alteration or enlargement
or any change whatsoever.

         In the event the certification set forth above in the Form of
Assignment or the Form of Election to Purchase, as the case may be, is not
completed, the Company and the Rights Agent will deem the beneficial owner of
the Rights evidenced by this Right Certificate to be an Acquiring Person or an
Affiliate or Associate thereof (as defined in the Rights Agreement) and such
Assignment or Election to Purchase will not be honored.

<PAGE>   1
                                                                     EXHIBIT 2.1



                      NELLCOR PURITAN BENNETT INCORPORATED

                                       and

                        THE FIRST NATIONAL BANK OF BOSTON

                                  Rights Agent

                                RIGHTS AGREEMENT

                          Dated as of September 1, 1992

                             As Amended and Restated
                               as of March 8, 1996
<PAGE>   2
                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
SECTION                                                                                                       PAGE
- -------                                                                                                       ----
<S>               <C>                                                                                         <C>
Section  1.       Certain Definitions.......................................................................    1
Section  2.       Appointment of Rights Agent...............................................................    4
Section  3.       Issue of Right Certificates...............................................................    5
Section  4.       Form of Right Certificates................................................................    6
Section  5.       Countersignature and Registration.........................................................    7
Section  6.       Transfer, Split Up, Combination and Exchange of Right Certificates; Mutilated,
                  Destroyed, Lost or Stolen Right Certificates..............................................    7
Section  7.       Exercise of Rights; Purchase Price; Expiration Date of Rights.............................    8
Section  8.       Cancellation and Destruction of Right Certificates........................................    9
Section  9.       Availability of Preferred Shares..........................................................    9
Section 10.       Preferred Shares Record Date..............................................................    9
Section 11.       Adjustment of Purchase Price, Number of Shares or Number of Rights........................   10
Section 12.       Certificate of Adjusted Purchase Price or Number of Shares................................   17
Section 13.       Consolidation, Merger or Sale or Transfer of Assets or Earning Power......................   17
Section 14.       Fractional Rights and Fractional Shares...................................................   20
Section 15.       Rights of Action..........................................................................   21
Section 16.       Agreement of Right Holders................................................................   21
Section 17.       Right Certificate Holder Not Deemed a Stockholder.........................................   22
Section 18.       Concerning the Rights Agent...............................................................   22
Section 19.       Merger or Consolidation or Change of Name of Rights Agent.................................   22
Section 20.       Duties of Rights Agent....................................................................   23
Section 21.       Change of Rights Agent....................................................................   25
</TABLE>

                                       i
<PAGE>   3
<TABLE>
<CAPTION>
SECTION                                                                                                       PAGE
- -------                                                                                                       ----
<S>               <C>                                                                                         <C>
Section 22.       Issuance of New Right Certificates........................................................   25
Section 23.       Redemption................................................................................   26
Section 24.       Exchange..................................................................................   27
Section 25.       Notice of Certain Events..................................................................   29
Section 26.       Notices...................................................................................   29
Section 27.       Supplements and Amendments................................................................   30
Section 28.       Determination and Actions by the Board of Directors, etc..................................   30
Section 29.       Successors................................................................................   31
Section 30.       Benefits of this Agreement................................................................   31
Section 31.       Severability..............................................................................   31
Section 32.       Governing Law.............................................................................   31
Section 33.       Counterparts..............................................................................   31
Section 34.       Descriptive Headings......................................................................   31


Exhibit A         Form of Certificate of Determination of Preferences of Series A Junior Participating
                  Preferred Stock ..........................................................................   A-1
Exhibit B         Form of Right Certificate.................................................................   B-1
Exhibit C         Summary of Rights to Purchase Preferred Shares............................................   C-1
</TABLE>

                                       ii
<PAGE>   4
                                RIGHTS AGREEMENT

         Rights Agreement, dated as of September 1, 1992, between Nellcor
Puritan Bennett Incorporated, a Delaware corporation (the "Company"), and The
First National Bank of Boston, a national banking association (the "Rights
Agent"), as amended on September 1, 1992, and as amended and restated as of
March 8, 1996 (the "Agreement").

         On June 11, 1991, the Board of Directors of the Company authorized and
declared a dividend of one preferred share purchase right (a "Right") for each
Common Share (as hereinafter defined) of the Company outstanding at the close of
business on June 26, 1991 (the "Record Date"), each Right representing the right
to purchase one one-hundredth of a Preferred Share (as hereinafter defined),
upon the terms and subject to the conditions herein set forth, and has further
authorized and directed the issuance of one Right (as such number may be
adjusted pursuant hereto) with respect to each Common Share that shall become
outstanding (whether originally issued or delivered from the Company's treasury)
between the Record Date and the earliest of the Distribution Date, the
Redemption Date and the Final Expiration Date (as such terms are hereinafter
defined). On September 1, 1992, the Agreement was amended.

         On March 8,1996, the Board of Directors determined to amend and restate
the Agreement and directed the Rights Agent to enter into this Amendment and
Restatement.

         Accordingly, in consideration of the premises and the mutual agreements
herein set forth, the parties hereby agree as follows:

         Section 1. Certain Definitions. For purposes of this Agreement, the
following terms have the meanings indicated:

         (a) "Acquiring Person" shall mean any Person (as such term is
hereinafter defined) who or which, together with all Affiliates and Associates
(as such terms are hereinafter defined) of such Person, shall be the Beneficial
Owner (as such term is hereinafter defined) of 15% or more of the Common Shares
of the Company then outstanding, but shall not include (i) the Company, (ii) any
Subsidiary (as such term is hereinafter defined) of the Company, (iii) any
employee benefit plan of the Company or any Subsidiary of the Company, or (iv)
any entity holding Common Shares for or pursuant to the terms of any such plan
(each of (i), (ii), (iii) and (iv) is herein referred to as an "Exempt Person").
Notwithstanding the foregoing, no Person shall become an "Acquiring Person" as
the result of an acquisition of Common Shares by the Company which, by reducing
the number of shares outstanding, increases the proportionate number of shares
beneficially owned by such Person to 15% or more of the Common Shares of the
Company then outstanding; provided, however, that if a Person shall become the
Beneficial Owner of 15% or more of the Common Shares of the Company then
outstanding by reason of share purchases by the Company and shall, after such
share purchases by the Company, become the Beneficial Owner of any additional
Common Shares of the Company, then such Person shall be deemed to be an
"Acquiring Person", unless upon becoming the Beneficial Owner of such additional
shares such Person is the Beneficial Owner of less than 15% of the then
outstanding 

                                       1
<PAGE>   5
Common Shares. Notwithstanding the foregoing, if the Board of Directors of the
Company determines in good faith that a Person who would otherwise be an
"Acquiring Person", as defined pursuant to the foregoing provisions of this
paragraph (a), has become such inadvertently, and such Person divests as
promptly as practicable a sufficient number of Common Shares so that such Person
would no longer be an Acquiring Person, as defined pursuant to the foregoing
provisions of this paragraph (a), then such Person shall not be deemed to be an
"Acquiring Person" for any purposes of this Agreement, provided, however, that
such Person does not become the Beneficial Owner of any additional Common Shares
after such Person becomes aware that such Person would be an Acquiring Person
(but for the operation of this sentence), unless upon becoming the Beneficial
Owner of such additional Common Shares such person is the Beneficial Owner of
less than 15% of the then outstanding Common Shares.

         (b) "Affiliate" and "Associate" shall have the respective meanings
ascribed to such terms in Rule 12b-2 of the General Rules and Regulations under
the Securities Exchange Act of 1934, as amended (the "Exchange Act"), as in
effect on the date of this Agreement.

         (c) A Person shall be deemed the "Beneficial Owner" of, and shall be
deemed to have "Beneficial Ownership" of, and to "beneficially own", any
securities:

             (i)   of which such Person or any of such Person's Affiliates or
         Associates is considered to be a "beneficial owner" under Rule 13d-3 of
         the General Rules and Regulations under the Exchange Act as in effect
         on the date hereof (the "Exchange Act Regulations"); provided, however,
         that a Person shall not be deemed the "Beneficial Owner" of, to have
         "Beneficial Ownership" of, or to "beneficially own", any securities
         under this subparagraph (i) as a result of an agreement, arrangement or
         understanding to vote such securities if such agreement, arrangement or
         understanding (A) arises solely from a revocable proxy or consent given
         in response to a public proxy or consent solicitation made pursuant to,
         and in accordance with, the applicable provisions of the Exchange Act
         and the Exchange Act Regulations, and (B) is not reportable by such
         Person on Schedule 13D under the Exchange Act (or any comparable or
         successor report);

             (ii)  which are beneficially owned, directly or indirectly, by any
         other Person (or any Affiliate or Associate of such other Person) with
         which such Person (or any of such Person's Affiliates or Associates)
         has any agreement, arrangement or understanding (whether or not in
         writing), for the purpose of acquiring, holding, voting (except
         pursuant to a revocable proxy or consent as described in the proviso to
         subparagraph (i) of this paragraph (c)) or disposing of such
         securities; or

             (iii) which such Person or any of such Person's Affiliates or
         Associates, directly or indirectly, has the right to acquire (whether
         such right is exercisable immediately or only after the passage of time
         or upon the satisfaction of conditions) pursuant to any agreement,
         arrangement or understanding (whether or not in writing) or upon the
         exercise of conversion rights, exchange rights, warrants or options, or
         otherwise;

                                       2
<PAGE>   6
provided, however, that under this paragraph (c) a Person shall not be deemed
the "Beneficial Owner" of, to have "Beneficial Ownership" of, or to
"beneficially own", (A) securities tendered pursuant to a tender or exchange
offer made in accordance with Exchange Act Regulations by such Person or any of
such Person's Affiliates or Associates until such tendered securities are
accepted for purchase or exchange, (B) securities that may be issued upon
exercise of Rights at any time prior to the occurrence of a Triggering Event, or
(C) securities that may be issued upon exercise of Rights from and after the
occurrence of a Triggering Event, which Rights were acquired by such Person or
any of such Person's Affiliates or Associates prior to the Distribution Date or
pursuant to Section 3(c) or Section 22 hereof (the "Original Rights") or
pursuant to Section 11(i) hereof in connection with an adjustment made with
respect to any Original Rights; and further provided, however, that (x) nothing
in this paragraph (c) shall cause a Person engaged in business as an underwriter
of securities to be the "Beneficial Owner" of, to have "Beneficial Ownership"
of, or to "beneficially own," any securities acquired through such Person's
participation in good faith in a firm commitment underwriting until the
expiration of forty days after the date of such acquisition, (y) no decision
reached, or action taken, by the Board of Directors of the Company or any
committee thereof shall cause any Person (or any Affiliate or Associate of such
Person) who is a member of the Board of Directors of the Company or such
committee to be deemed, for the purposes of this Agreement, to be a "Beneficial
Owner" of, to have "Beneficial Ownership" of, or to "beneficially own" any
securities beneficially owned by any other Person (or any Affiliate or Associate
of such Person) who is a member of the Board of Directors of the Company or any
committee thereof solely by reason of such membership of the Board of Directors
or any committee thereof or participation in the decisions or actions thereof on
the part of either or both of such Persons and (z) no Person who is an officer,
director or employee of an Exempt Person shall be deemed, solely by reason of
such Person's status or authority as such, to be the "Beneficial Owner" of, to
have "Beneficial Ownership" of or to "beneficially own" any securities that are
"beneficially owned" (as defined in this paragraph (c)), including, without
limitation, in a fiduciary capacity, by an Exempt Person or by any other such
officer, director or employee of an Exempt Person.

         (d) "Business Day" shall mean any day other than a Saturday, a Sunday,
or a day on which banking institutions in the Commonwealth of Massachusetts are
authorized or obligated by law or executive order to close.

         (e) "Close of Business" on any given date shall mean 5:00 p.m., Boston
time, on such date; provided, however, that if such date is not a Business Day,
it shall mean 5:00 p.m., Boston time, on the next succeeding Business Day.

         (f) "Common Shares" when used with reference to the Company shall mean
the shares of common stock, par value $. 001 per share, of the Company. "Common
Shares" when used with reference to any Person other than the Company shall mean
the capital stock (or equity interest) with the greatest voting power of such
other Person or, if such other Person is a Subsidiary of another Person, the
Person or Persons which ultimately control such first-mentioned Person.

         (g) "Distribution Date" shall have the meaning set forth in Section 3
hereof.

                                       3
<PAGE>   7
         (h) "Expiration Date" shall have the meaning set forth in Section 7(a)
hereof.

         (i) "Final Expiration Date" shall have the meaning set forth in Section
7(a) hereof.

         (j) "Incumbent Board" shall mean those members of the Board of
Directors that include (i) any member of the Board of Directors of the Company,
while such Person is a member of the Board, who is not an Acquiring Person, or
an Affiliate or Associate of an Acquiring Person, or a representative of an
Acquiring Person or of any such Affiliate or Associate, and was a member of the
Board prior to the earlier of a Section 11(a)(ii) Event or Distribution Date,
and (ii) any other Person who subsequently becomes a member of the Board, while
such Person is a member of the Board, who is not an Acquiring Person, or an
Affiliate or Associate of an Acquiring Person, or a representative of an
Acquiring Person or of any such Affiliate or Associate, if such other Person's
nomination for election or election to the Board is recommended or approved by a
majority of the Incumbent Board.

         (k) "Person" shall mean any individual, firm, corporation or other
entity, and shall include any successor (by merger or otherwise) of such entity.

         (l) "Preferred Shares" shall mean shares of Series A Junior
Participating Preferred Stock, par value $.001 per share, of the Company having
the rights, privileges and preferences set forth in the Form of Certificate of
Determination of Preferences attached to this Agreement as Exhibit A.

         (m) "Redemption Date" shall have the meaning set forth in Section 7
hereof.

         (n) "Shares Acquisition Date" shall mean the first date of public
announcement by the Company or an Acquiring Person that an Acquiring Person has
become such.

         (o) "Section 11(a)(ii) Event" shall have the meaning set forth in
Section 11(a)(ii) hereof.

         (p) "Section 13 Event" shall have the meaning set forth in Section 13
hereof.

         (q) "Subsidiary" of any Person shall mean any corporation or other
entity of which a majority of the voting power of the voting equity securities
or equity interest is owned, directly or indirectly, by such Person.

         (r) "Triggering Event" shall mean a Section 11(a)(ii) Event or any
Section 13 Event.

         (s) "Voting Power" shall mean the voting power of all securities of the
Company then outstanding and generally entitled to vote for the election of
directors of the Company.

         Section 2. Appointment of Rights Agent. The Company hereby appoints the
Rights Agent to act as agent for the Company and the holders of the Rights (who,
in accordance with Section 3 hereof, shall prior to the Distribution Date also
be the holders of the Common Shares) in accordance with the terms and conditions
hereof, and the Rights Agent hereby accepts such 

                                       4
<PAGE>   8
appointment. The Company may from time to time appoint such co-Rights Agents as
it may deem necessary or desirable.

         Section 3. Issue of Right Certificates.

         (a) Until the earlier of (i) the tenth day after the Shares Acquisition
Date or (ii) the tenth Business Day (or such later date as may be determined by
action of the Board of Directors prior to such time as any Person becomes an
Acquiring Person) after the date of the commencement (determined in accordance
with Rule 14d-2 under the Exchange Act) by any Person (other than the Company,
any Subsidiary of the Company, any employee benefit plan of the Company or of
any Subsidiary of the Company or any entity holding Common Shares for or
pursuant to the terms of any such plan) of, or of the first public announcement
of the intention of any Person (other than the Company, any Subsidiary of the
Company, any employee benefit plan of the Company or of any Subsidiary of the
Company or any entity holding Common Shares for or pursuant to the terms of any
such plan) to commence, a tender or exchange offer the consummation of which
would result in any Person becoming the Beneficial Owner of Common Shares
aggregating 15% or more of the then outstanding Common Shares (including any
such date which is after the date of this Agreement and prior to the issuance of
the Rights, the earlier of such dates being herein referred to as the
"Distribution Date"), (x) the Rights will be evidenced by the certificates for
Common Shares registered in the names of the holders thereof (which certificates
shall also be deemed to be Right Certificates) and not by separate Right
Certificates, and (y) the Rights (and the right to receive Right Certificates
therefor) will be transferable only in connection with the transfer of Common
Shares. As soon as practicable after the Distribution Date, the Company will
prepare and execute, the Rights Agent will countersign, and the Company will
send or cause to be sent (and the Rights Agent will, if requested, send) by
first-class, insured, postage-prepaid mail, to each record holder of Common
Shares as of the close of business on the Distribution Date, at the address of
such holder shown on the records of the Company, a Right Certificate, in
substantially the form of Exhibit B hereto (a "Right Certificate"), evidencing
one Right for each Common Share so held. As of the Distribution Date, the Rights
will be evidenced solely by such Right Certificates.

         In the event that an adjustment in the number of Rights per Common
Share has been made pursuant to Section 11(p) hereof, at the time of
distribution of the Right Certificates, the Company may make the necessary and
appropriate rounding adjustments (in accordance with Section 14(a) hereof) so
that Right Certificates representing only whole numbers of Rights are
distributed and cash is paid in lieu of any fractional Rights.

         (b) On the Record Date, or as soon as practicable thereafter, the
Company will send a copy of a Summary of Rights to Purchase Preferred Shares, in
substantially the form of Exhibit C hereto (the "Summary of Rights"), by
first-class, postage-prepaid mail, to each record holder of Common Shares as of
the close of business on the Record Date, at the address of such holder shown on
the records of the Company. With respect to certificates for Common Shares
outstanding as of the Record Date, until the Distribution Date, the Rights will
be evidenced by 

                                       5
<PAGE>   9
such certificates registered in the names of the holders thereof together with
the Summary of Rights. Until the Distribution Date (or, if earlier, the
Expiration Date), the surrender for transfer of any certificate for Common
Shares outstanding on the Record Date shall also constitute the transfer of the
Rights associated with the Common Shares represented thereby.

         (c) Certificates for Common Shares which become outstanding (including,
without limitation, reacquired Common Shares referred to in the last sentence of
this paragraph (c)) after the Record Date but prior to the earlier of the
Distribution Date and the Expiration Date shall have impressed on, printed on,
written on or otherwise affixed to them the following legend:

         This certificate also evidences and entitles the holder hereof to
         certain rights as set forth in a Rights Agreement between Nellcor
         Puritan Bennett Incorporated and The First National Bank of Boston,
         dated as of September 1, 1992, as amended from time to time (the
         "Rights Agreement"), the terms of which are hereby incorporated herein
         by reference and a copy of which is on file at the principal executive
         offices of Nellcor Puritan Bennett Incorporated. Under certain
         circumstances, as set forth in the Rights Agreement, such Rights will
         be evidenced by separate certificates and will no longer be evidenced
         by this certificate. Nellcor Puritan Bennett Incorporated will mail to
         the holder of this certificate a copy of the Rights Agreement without
         charge after receipt of a written request therefor. UNDER CERTAIN
         CIRCUMSTANCES SET FORTH IN THE RIGHTS AGREEMENT, RIGHTS ISSUED TO, OR
         HELD BY, ANY PERSON WHO IS, WAS OR BECOMES AN ACQUIRING PERSON OR ANY
         AFFILIATE OR ASSOCIATE THEREOF (AS SUCH TERMS ARE DEFINED IN THE RIGHTS
         AGREEMENT), WHETHER CURRENTLY HELD BY OR ON BEHALF OF SUCH PERSON OR BY
         ANY SUBSEQUENT HOLDER, MAY BECOME NULL AND VOID.

With respect to such certificates containing the foregoing legend, until the
Distribution Date, the Rights associated with the Common Shares represented by
such certificates shall be evidenced by such certificates alone, and the
surrender for transfer of any such certificate shall also constitute the
transfer of the Rights associated with the Common Shares represented thereby. In
the event that the Company purchases or acquires any Common Shares after the
Record Date but prior to the Distribution Date, any Rights associated with such
Common Shares shall be deemed cancelled and retired so that the Company shall
not be entitled to exercise any Rights associated with the Common Shares which
are no longer outstanding.

         Section 4. Form of Right Certificates. The Right Certificates (and the
form of election to purchase Preferred Shares, the form of assignment and the
form of certification to be printed on the reverse thereof) shall be
substantially the same as Exhibit B hereto and may have such marks of
identification or designation and such legends, summaries or endorsements
printed thereon as the Company may deem appropriate and as are not inconsistent
with the provisions of this Agreement, or as may be required to comply with any
applicable law or with any rule or regulation made pursuant thereto or with any
rule or regulation of any stock exchange on which the Rights may from time to
time be listed, or to conform to usage. Subject to the provisions of 

                                       6
<PAGE>   10
Section 22 hereof, the Right Certificates shall entitle the holders thereof to
purchase such number of one one-hundredths of a Preferred Share as shall be set
forth therein at the price per one one-hundredth of a Preferred Share set forth
therein (the "Purchase Price"), but the number of such one one-hundredths of a
Preferred Share and the Purchase Price shall be subject to adjustment as
provided herein.

         Section 5. Countersignature and Registration. The Right Certificates
shall be executed on behalf of the Company by its Chairman of the Board, its
Chief Executive Officer, its President, its Vice Chairman of the Board, its
Chief Financial Officer, or any of its Vice Presidents, either manually or by
facsimile signature, shall have affixed thereto the Company's seal or a
facsimile thereof, and shall be attested by the Secretary or an Assistant
Secretary of the Company, either manually or by facsimile signature. The Right
Certificates shall be manually countersigned by the Rights Agent and shall not
be valid for any purpose unless countersigned. In case any officer of the
Company who shall have signed any of the Right Certificates shall cease to be
such officer of the Company before countersignature by the Rights Agent and
issuance and delivery by the Company, such Right Certificates, nevertheless, may
be countersigned by the Rights Agent and issued and delivered by the Company
with the same force and effect as though the person who signed such Right
Certificates had not ceased to be such officer of the Company; and any Right
Certificate may be signed on behalf of the Company by any person who, at the
actual date of the execution of such Right Certificate, shall be a proper
officer of the Company to sign such Right Certificate, although at the date of
the execution of this Rights Agreement any such person was not such an officer.

         Following the Distribution Date, the Rights Agent will keep or cause to
be kept, at its office designated for such purpose, books for registration and
transfer of the Right Certificates issued hereunder. Such books shall show the
names and addresses of the respective holders of the Right Certificates, the
number of Rights evidenced on its face by each of the Right Certificates and the
date of each of the Right Certificates.

         Section 6. Transfer, Split Up, Combination and Exchange of Right
Certificates; Mutilated, Destroyed, Lost or Stolen Right Certificates. Subject
to the provisions of Section 14 hereof, at any time after the Close of Business
on the Distribution Date, and at or prior to the Close of Business on the
earlier of the Redemption Date and the Expiration Date, any Right Certificate or
Right Certificates (other than Right Certificates representing Rights that have
become void pursuant to Section 11(a)(ii) hereof or that have been exchanged
pursuant to Section 24 hereof) may be transferred, split up, combined or
exchanged for another Right Certificate or Right Certificates, entitling the
registered holder to purchase a like number of one one-hundredths of a Preferred
Share as the Right Certificate or Right Certificates surrendered then entitled
such holder to purchase. Any registered holder desiring to transfer, split up,
combine or exchange any Right Certificate or Right Certificates shall make such
request in writing delivered to the Rights Agent, and shall surrender the Right
Certificate or Right Certificates to be transferred, split up, combined or
exchanged at the office of the Rights Agent designated for such purpose.
Thereupon the Rights Agent shall countersign and deliver to the person entitled
thereto a Right Certificate or Right Certificates, as the case may be, as so
requested. The Company may require payment of a sum sufficient to cover any tax
or 

                                       7
<PAGE>   11
governmental charge that may be imposed in connection with any transfer, split
up, combination or exchange of Right Certificates.

         Upon receipt by the Company and the Rights Agent of evidence reasonably
satisfactory to them of the loss, theft, destruction or mutilation of a Right
Certificate, and, in case of loss, theft or destruction, of indemnity or
security reasonably satisfactory to them, and, at the Company's request,
reimbursement to the Company and the Rights Agent of all reasonable expenses
incidental thereto, and upon surrender to the Rights Agent and cancellation of
the Right Certificate if mutilated, the Company will issue, execute and deliver
a new Right Certificate of like tenor to the Rights Agent for countersignature
and delivery to the registered holder in lieu of the Right Certificate so lost,
stolen, destroyed or mutilated.

         Section 7. Exercise of Rights; Purchase Price; Expiration Date of
Rights.

         (a) The registered holder of any Right Certificate may exercise the
Rights evidenced thereby (except as otherwise provided herein) in whole or in
part at any time after the Distribution Date upon surrender of the Right
Certificate, with the form of election to purchase on the reverse side thereof
duly executed, to the Rights Agent at the office of the Rights Agent designated
for such purpose, together with payment of the Purchase Price for each one
one-hundredth of a Preferred Share (or such other number of shares or other
securities) as to which the Rights are exercised, at or prior to the earliest of
(i) the close of business on March 8, 2006 (the "Final Expiration Date"), (ii)
the time at which the Rights are redeemed as provided in Section 23 hereof (the
"Redemption Date"), or (iii) the time at which such Rights are exchanged as
provided in Section 24 hereof (the earliest of (i), (ii) and (iii) being herein
referred to as the "Expiration Date").

         (b) The Purchase Price for each one one-hundredth of a Preferred Share
pursuant to the exercise of a Right shall initially be $320, shall be subject to
adjustment from time to time as provided in Sections 11 and 13 hereof and shall
be payable in lawful money of the United States of America in accordance with
paragraph (c) below.

         (c) Upon receipt of a Right Certificate representing exercisable
Rights, with the form of election to purchase duly executed, accompanied by
payment of the Purchase Price for the shares to be purchased and an amount equal
to any applicable transfer tax required to be paid by the holder of such Right
Certificate in accordance with Section 9 hereof by certified check, cashier's
check, bank draft or money order payable to the order of the Company, the Rights
Agent shall thereupon promptly (i) (A) requisition from any transfer agent for
the Preferred Shares certificates for the number of Preferred Shares to be
purchased, and the Company hereby irrevocably authorizes its transfer agent to
comply with all such requests, or (B) requisition from the depository agent
depository receipts representing such number of one one-hundredths of a
Preferred Share as are to be purchased (in which case certificates for the
Preferred Shares represented by such receipts shall be deposited by the transfer
agent with the depository agent), and the Company hereby directs the depository
agent to comply with such request, (ii) when appropriate, requisition from the
Company the amount of cash to be paid in lieu of issuance of fractional shares
in accordance with Section 14 hereof, (iii) after receipt of such certificates
or 


                                       8
<PAGE>   12
depository receipts, cause the same to be delivered to or upon the order of
the registered holder of such Right Certificate, registered in such name or
names as may be designated by such holder and (iv) when appropriate, after
receipt, deliver such cash to or upon the order of the registered holder of such
Right Certificate.

         (d) In case the registered holder of any Right Certificate shall
exercise fewer than all the Rights evidenced thereby, a new Right Certificate
evidencing Rights equivalent to the Rights remaining unexercised shall be issued
by the Rights Agent to the registered holder of such Right Certificate or to his
duly authorized assigns, subject to the provisions of Section 14 hereof.

         (e) The Company covenants and agrees that it will cause to be reserved
and kept available out of its authorized and unissued Preferred Shares or any
Preferred Shares held in its treasury, the number of Preferred Shares that will
be sufficient to permit the exercise in full of all outstanding Rights in
accordance with this Section 7.

         (f) Notwithstanding anything in this Agreement to the contrary, neither
the Rights Agent nor the Company shall be obligated to undertake any action with
respect to a registered holder upon the occurrence of any purported exercise as
set forth in this Section 7 unless such registered holder shall have (i)
completed and signed the certification following the form of election to
purchase set forth on the reverse side of the Rights Certificate surrendered for
such exercise and (ii) provided such additional evidence of the identity of the
Beneficial Owner (or former Beneficial Owner) or Affiliates or Associates
thereof as the Company shall reasonably request.

         Section 8. Cancellation and Destruction of Right Certificates. All
Right Certificates surrendered for the purpose of exercise, transfer, split up,
combination or exchange shall, if surrendered to the Company or to any of its
agents, be delivered to the Rights Agent for cancellation or in cancelled form,
or, if delivered or surrendered to the Rights Agent, shall be cancelled by it,
and no Right Certificates shall be issued in lieu thereof except as expressly
permitted by any of the provisions of this Rights Agreement. The Company shall
deliver to the Rights Agent for cancellation and retirement, and the Rights
Agent shall so cancel and retire, any other Right Certificate purchased or
acquired by the Company otherwise than upon the exercise thereof. The Rights
Agent shall deliver all cancelled Right Certificates to the Company, or shall,
at the written request of the Company, destroy such cancelled Right
Certificates, and in such case shall deliver a certificate of destruction
thereof to the Company.

         Section 9. Availability of Preferred Shares. The Company covenants and
agrees that it will take all such action as may be necessary to ensure that all
Preferred Shares delivered upon exercise of Rights shall, at the time of
delivery of the certificates for such Preferred Shares (subject to payment of
the Purchase Price), be duly and validly authorized and issued and fully paid
and nonassessable shares.

         The Company further covenants and agrees that it will pay when due and
payable any and all federal and state transfer taxes and charges which may be
payable in respect of the issuance or delivery of the Right Certificates or of
any Preferred Shares upon the exercise of Rights. The Company shall not,
however, be required to pay any transfer tax which may be payable in respect

                                       9
<PAGE>   13
of any transfer or delivery of Right Certificates to a person other than, or the
issuance or delivery of certificates or depository receipts for the Preferred
Shares in a name other than that of, the registered holder of the Right
Certificate evidencing Rights surrendered for exercise or to issue or to deliver
any certificates or depository receipts for Preferred Shares upon the exercise
of any Rights until any such tax shall have been paid (any such tax being
payable by the holder of such Right Certificate at the time of surrender) or
until it has been established to the Company's reasonable satisfaction that no
such tax is due.

         Section 10. Preferred Shares Record Date. Each person in whose name any
certificate for Preferred Shares or other securities is issued upon the exercise
of Rights shall for all purposes be deemed to have become the holder of record
of the Preferred Shares or other securities represented thereby on, and such
certificate shall be dated, the date upon which the Right Certificate evidencing
such Rights was duly surrendered with the forms of election and certification
duly executed and payment of the Purchase Price (and any applicable transfer
taxes) was made; provided, however, that if the date of such surrender and
payment is a date upon which the Preferred Shares or other securities transfer
books of the Company are closed, such person shall be deemed to have become the
record holder of such shares on, and such certificate shall be dated, the next
succeeding Business Day on which the Preferred Shares or other securities
transfer books of the Company are open. Prior to the exercise of the Rights
evidenced thereby, the holder of a Right Certificate, as such, shall not be
entitled to any rights of a holder of Preferred Shares for which the Rights
shall be exercisable, including, without limitation, the right to vote, to
receive dividends or other distributions or to exercise any preemptive rights,
and shall not be entitled to receive any notice of any proceedings of the
Company, except as provided herein.

         Section 11. Adjustment of Purchase Price, Number of Shares or Number of
Rights. The Purchase Price, the number of Preferred Shares covered by each Right
and the number of Rights outstanding are subject to adjustment from time to time
as provided in this Section 11.

         (a) (i) In the event the Company shall at any time after the date of
this Agreement (A) declare a dividend on the Preferred Shares payable in
Preferred Shares, (B) subdivide the outstanding Preferred Shares, (C) combine
the outstanding Preferred Shares into a smaller number of Preferred Shares or
(D) issue any shares of its capital stock in a reclassification of the Preferred
Shares (including any such reclassification in connection with a consolidation
or merger in which the Company is the continuing or surviving corporation),
except as otherwise provided in this Section 11(a), the Purchase Price in effect
at the time of the record date for such dividend or of the effective date of
such subdivision, combination or reclassification, and the number and kind of
shares of capital stock issuable on such date, shall be proportionately adjusted
so that the holder of any Right exercised after such time shall be entitled to
receive the aggregate number and kind of shares of capital stock which, if such
Right had been exercised immediately prior to such date and at a time when the
Preferred Shares transfer books of the Company were open, he would have owned
upon such exercise and been entitled to receive by virtue of such dividend,
subdivision, combination or reclassification; provided, however, that in no
event shall the consideration to be paid upon the exercise of one Right be less
than the aggregate par value of the shares of capital stock of the Company
issuable upon exercise of one 

                                       10
<PAGE>   14
Right. If an event occurs which would require an adjustment under both Section
11(a)(i) and Section 11(a)(ii), the adjustment provided for in this Section
11(a)(i) shall be in addition to, and shall be made prior to, any adjustment
required pursuant to Section 11(a)(ii).

                (ii) Subject to Sections 23 and 24 of this Agreement, in the
event any Person shall become an Acquiring Person (a "Section 11(a)(ii) Event"),
unless the event causing the Person to beneficially own 15% or more of the
outstanding Common Shares is an acquisition of Common Shares pursuant to a
tender offer or an exchange offer for all outstanding Common Shares at a price
and on terms determined by at least a majority of the Board of Directors
(including a majority of the Incumbent Board), after receiving advice from one
or more investment banking firms, to be (a) at a price which is fair to the
stockholders of the Company (taking into account all factors which such members
of the Board and the Incumbent Board deem relevant (including, without
limitation, prices which could reasonably be achieved if the Company or its
assets were sold on an orderly basis designed to realize maximum value)) and (b)
otherwise in the best interests of the Company and its stockholders
(hereinafter, a "Qualifying Offer"), each holder of a Right shall, for a period
of 60 days commencing on the next succeeding Business Day after the date of
expiration or termination of the redemption option set forth in Section 23
(provided that, if at any time prior to the expiration or termination of such
60-day period there shall be a temporary restraining order, a preliminary
injunction, an injunction, or temporary suspension by the Board of Directors, or
similar obstacle to exercise of the Rights (the "Injunction") which prevents
exercise of the Rights, a new 60-day period shall commence on the date the
Injunction is removed), have a right to receive, upon exercise thereof at a
price equal to the then current Purchase Price multiplied by the number of one
one-hundredths of a Preferred Share for which a Right is then exercisable, in
accordance with the terms of this Agreement and in lieu of Preferred Shares,
such number of Common Shares of the Company as shall equal the result obtained
by (A) multiplying the then current Purchase Price by the number of one
one-hundredths of a Preferred Share for which a Right is then exercisable and
dividing that product by (B) 50% of the then current per share market price of
the Company's Common Shares (determined pursuant to Section 11(d) hereof) on the
date such Person became an Acquiring Person; provided, however, that if the
transaction that would otherwise give rise to the foregoing adjustment is also
subject to the provisions of Section 13 hereof, then only the provisions of
Section 13 hereof shall apply and no adjustment shall be made pursuant to this
Section 11(a)(ii). Subject to Sections 23 and 24 hereof, in the event that there
shall be a Section 11(a)(ii) Event and the Rights shall then be outstanding, the
Company shall not take any action which would eliminate or diminish the benefits
intended to be afforded by the Rights.

         Notwithstanding anything in this Agreement to the contrary, and after
the time any Person becomes an Acquiring Person, any Rights beneficially owned
by (i) such Acquiring Person or an Associate or Affiliate of such Acquiring
Person, (ii) a transferee of such Acquiring Person (or of any such Associate or
Affiliate) who becomes a transferee after the Acquiring Person became such, or
(iii) a transferee of such Acquiring Person (or of any such Associate or
Affiliate) who becomes a transferee prior to or concurrently with the Acquiring
Person's becoming such and receives such Rights pursuant to either (A) a
transfer (whether or not for consideration) from the Acquiring Person to holders
of equity interests in such Acquiring Person or to any Person with whom the
Acquiring Person has any continuing agreement, arrangement or

                                       11
<PAGE>   15
understanding regarding the transferred Rights or (B) a transfer which the Board
of Directors of the Company has determined is part of a plan, arrangement or
understanding which has as a primary purpose or effect the avoidance of this
Section 11(a)(ii), shall become null and void without any further action and no
holder of such Rights shall have any rights whatsoever with respect to such
Rights, whether under any provision of this Agreement or otherwise. The Company
shall use all reasonable efforts to ensure that the provisions of this Section
11(a)(ii) are complied with, but shall have no liability to any holder of Right
Certificates or other Person as a result of the Company's failure to make any
determinations with respect to an Acquiring Person or its Affiliates, Associates
or transferees hereunder. No Right Certificate shall be issued at any time upon
the transfer of any Rights to an Acquiring Person whose Rights would be void
pursuant to the preceding sentence or any Associate or Affiliate thereof or to
any nominee of such Acquiring Person, Associate or Affiliate, and any Right
Certificate delivered to the Rights Agent for transfer to an Acquiring Person
whose Rights would be void pursuant to the preceding sentence shall be
cancelled.

                (iii) In the event that there shall not be sufficient Common
Shares issued but not outstanding or authorized but unissued to permit the
exercise in full of the Rights in accordance with the foregoing subparagraph
(ii), the Board of Directors, in the event the Rights become so exercisable and
if the Board of Directors determines that such action is necessary or
appropriate and not contrary to the interests of the holders of Rights, may, but
shall not be required to, with respect to each Right (A) take all such action as
may be necessary to authorize additional Common Shares for issuance upon
exercise of the Rights, or (B) pay cash in an amount equal to the Purchase
Price, in lieu of issuing Common Shares and requiring payment therefor, or (C)
issue debt or equity securities (including, without limitation, shares, or
fractions of shares, of preferred stock, including Preferred Shares, which the
Board of Directors has deemed to have the same value as Common Shares) or a
combination thereof, having a value equal to the Current Value of the Common
Shares (as defined hereinafter), where the value of such securities shall be
determined by a nationally recognized investment banking firm selected by the
Board of Directors of the Company, and require the payment of the Purchase
Price, or (D) deliver any combination of cash, property, Common Shares,
Preferred Shares and/or other securities having a value equal to the Current
Value, and require payment of all or any requisite portions of the Purchase
Price. The Current Value shall be the product of the current per share market
price of Common Shares (determined pursuant to Section 11(d) on the date of the
occurrence of the event described above in subparagraph (ii)) multiplied by the
number of Common Shares for which the Right otherwise would be exercisable if
there were sufficient shares available. To the extent that the Company
determines that some action need be taken pursuant to clause (A), (B), (C) or
(D) of this Section 11(a)(iii), the Board of Directors may temporarily suspend
the exercisability of the Rights for a period of up to 45 days following the
date on which the event described in Section 11(a)(ii) shall have occurred, in
order to seek any authorization of additional Common Shares and/or to decide the
appropriate form of distribution to be made pursuant to the above provision and
to determine the value thereof. In the event of any such suspension, the Company
shall issue a public announcement stating that the exercisability of the Rights
has been temporarily suspended.

                                       12
<PAGE>   16
         (b) In case the Company shall fix a record date for the issuance of
rights, options or warrants to all holders of Preferred Shares entitling them
(for a period expiring within 45 calendar days after such record date) to
subscribe for or purchase Preferred Shares (or shares having the same rights,
privileges and preferences as the Preferred Shares ("equivalent preferred
shares")) or securities convertible into Preferred Shares or equivalent
preferred shares at a price per Preferred Share or equivalent preferred share
(or having a conversion price per share, if a security convertible into
Preferred Shares or equivalent preferred shares) less than the then current per
share market price of the Preferred Shares (as determined pursuant to Section
11(d)) on such record date, the Purchase Price to be in effect after such record
date shall be determined by multiplying the Purchase Price in effect immediately
prior to such record date by a fraction, the numerator of which shall be the
number of Preferred Shares outstanding on such record date plus the number of
Preferred Shares which the aggregate offering price of the total number of
Preferred Shares and/or equivalent preferred shares so to be offered (and/or the
aggregate initial conversion price of the convertible securities so to be
offered) would purchase at such current market price and the denominator of
which shall be the number of Preferred Shares outstanding on such record date
plus the number of additional Preferred Shares and/or equivalent preferred
shares to be offered for subscription or purchase (or into which the convertible
securities so to be offered are initially convertible); provided, however, that
in no event shall the consideration to be paid upon the exercise of one Right be
less than the aggregate par value of the shares of capital stock of the Company
issuable upon exercise of one Right. In case such subscription price may be paid
in a consideration part or all of which shall be in a form other than cash, the
value of such consideration shall be as determined in good faith by the Board of
Directors of the Company, whose determination shall be described in a statement
filed with the Rights Agent. Preferred Shares owned by or held for the account
of the Company shall not be deemed outstanding for the purpose of any such
computation. Such adjustment shall be made successively whenever such a record
date is fixed; and in the event that such rights, options or warrants are not so
issued, the Purchase Price shall be adjusted to be the Purchase Price which
would then be in effect if such record date had not been fixed.

         (c) In case the Company shall fix a record date for the making of a
distribution to all holders of the Preferred Shares (including any such
distribution made in connection with a consolidation or merger in which the
Company is the continuing or surviving corporation) of evidences of indebtedness
or assets (other than a regular quarterly cash dividend or a dividend payable in
Preferred Shares) or subscription rights or warrants (excluding those referred
to in Section 11(b) hereof), the Purchase Price to be in effect after such
record date shall be determined by multiplying the Purchase Price in effect
immediately prior to such record date by a fraction, the numerator of which
shall be the then current per share market price of the Preferred Shares (as
determined pursuant to Section 11(d)) on such record date, less the fair market
value (as determined in good faith by the Board of Directors of the Company,
whose determination shall be described in a statement filed with the Rights
Agent) of the portion of the assets or evidences of indebtedness so to be
distributed or of such subscription rights or warrants applicable to one
Preferred Share and the denominator of which shall be such current per share
market price of the Preferred Shares; provided, however, that in no event shall
the consideration to be paid upon the exercise of one Right be less than the
aggregate par value of the shares of capital stock of the Company to be issued
upon exercise of one Right. Such adjustments shall be 

                                       13
<PAGE>   17
made successively whenever such a record date is fixed; and in the event that
such distribution is not so made, the Purchase Price shall again be adjusted to
be the Purchase Price which would then be in effect if such record date had not
been fixed.

         (d) (i)  For the purpose of any computation hereunder, the "current per
share market price" of any security (a "Security" for the purpose of this
Section 11(d)(i)) on any date shall be deemed to be the average of the daily
closing prices per share of such Security for the 30 consecutive Trading Days
(as such term is hereinafter defined) immediately prior to such date; provided,
however, that in the event that the current per share market price of the
Security is determined during a period following the announcement by the issuer
of such Security of (A) a dividend or distribution on such Security payable in
shares of such Security or securities convertible into such shares, or (B) any
subdivision, combination or reclassification of such Security or securities
convertible into such shares, or (C) any subdivision, combination or
reclassification of such Security and prior to the expiration of 30 Trading Days
after the ex-dividend date for such dividend or distribution, or the record date
for such subdivision, combination or reclassification, then, and in each such
case, the current per share market price shall be appropriately adjusted to
reflect the current market price per share equivalent of such Security. The
closing price for each day shall be the last sale price, regular way, or, in
case no such sale takes place on such day, the average of the closing bid and
asked prices, regular way, in either case as reported in the principal
consolidated transaction reporting system with respect to securities listed or
admitted to trading on the New York Stock Exchange or, if the Security is not
listed or admitted to trading on the New York Stock Exchange, as reported in the
principal consolidated transaction reporting system with respect to securities
listed on the principal national securities exchange on which the Security is
listed or admitted to trading or, if the Security is not listed or admitted to
trading on any national securities exchange, the last quoted price or, if not so
quoted, the average of the high bid and low asked prices in the over-the-counter
market, as reported by the National Association of Securities Dealers, Inc.
Automated Quotations System ("NASDAQ") or such other system then in use, or, if
on any such date the Security is not quoted by any such organization, the
average of the closing bid and asked prices as furnished by a professional
market maker making a market in the Security selected by the Board of Directors
of the Company. The term "Trading Day" shall mean a day on which the principal
national securities exchange on which the Security is listed or admitted to
trading is open for the transaction of business or, if the Security is not
listed or admitted to trading on any national securities exchange, a Business
Day.

             (ii) For the purpose of any computation hereunder, the "current per
share market price" of the Preferred Shares shall be determined in accordance
with the method set forth in Section 11(d)(i). If the Preferred Shares are not
publicly traded, the "current per share market price" of the Preferred Shares
shall be conclusively deemed to be the current per share market price of the
Common Shares as determined pursuant to Section 11(d)(i) (appropriately adjusted
to reflect any stock split, stock dividend or similar transaction occurring
after the date hereof) multiplied by one hundred. If neither the Common Shares
nor the Preferred Shares are publicly held or so listed or traded, "current per
share market price" shall mean the fair value per share as determined in good
faith by the Board of Directors of the Company, whose determination shall be
described in a statement filed with the Rights Agent.

                                       14
<PAGE>   18
         (e) No adjustment in the Purchase Price shall be required unless such
adjustment would require an increase or decrease of at least 1% in the Purchase
Price; provided, however, that any adjustments which by reason of this Section
11(e) are not required to be made shall be carried forward and taken into
account in any subsequent adjustment. All calculations under this Section 11
shall be made to the nearest cent or to the nearest one one-millionth of a
Preferred Share or one ten-thousandth of any other share or security as the case
may be. Notwithstanding the first sentence of this Section 11(e), any adjustment
required by this Section 11 shall be made no later than the earlier of (i) three
years from the date of the transaction which requires such adjustment or (ii)
the date of the expiration of the right to exercise any Rights.

         (f) If as a result of an adjustment made pursuant to Section 11(a) or
Section 13(a) hereof, the holder of any Right thereafter exercised shall become
entitled to receive any shares of capital stock other than Preferred Shares,
thereafter the number of such other shares so receivable upon exercise of any
Right and the Purchase Price thereof shall be subject to adjustment from time to
time in a manner and on terms as nearly equivalent as practicable to the
provisions with respect to the Preferred Shares contained in Section 11(a), (b),
(c), (e), (g), (h), (i), (j), (k), (l) and (m) and the provisions of Sections 7,
9, 10, 13 and 14 with respect to the Preferred Shares shall apply on like terms
to any such other shares.

         (g) All Rights originally issued by the Company subsequent to any
adjustment made to the Purchase Price hereunder shall evidence the right to
purchase, at the adjusted Purchase Price, the number of one one-hundredths of a
Preferred Share purchasable from time to time hereunder upon exercise of the
Rights, all subject to further adjustment as provided herein.

         (h) Unless the Company shall have exercised its election as provided in
Section 11(i), upon each adjustment of the Purchase Price as a result of the
calculations made in Sections 11(b) and (c), each Right outstanding immediately
prior to the making of such adjustment shall thereafter evidence the right to
purchase, at the adjusted Purchase Price, that number of one one-hundredths of a
Preferred Share (calculated to the nearest one one-millionth of a Preferred
Share) obtained by (i) multiplying (x) the number of one one-hundredths of a
Preferred Share covered by a Right immediately prior to this adjustment by (y)
the Purchase Price in effect immediately prior to such adjustment of the
Purchase Price and (ii) dividing the product so obtained by the Purchase Price
in effect immediately after such adjustment of the Purchase Price.

         (i) The Company may elect on or after the date of any adjustment of the
Purchase Price to adjust the number of Rights, in substitution for any
adjustment in the number of one one-hundredths of a Preferred Share purchasable
upon the exercise of a Right. Each of the Rights outstanding after such
adjustment of the number of Rights shall be exercisable for the number of one
one-hundredths of a Preferred Share for which a Right was exercisable
immediately prior to such adjustment. Each Right held of record prior to such
adjustment of the number of Rights shall become that number of Rights
(calculated to the nearest one ten-thousandth) obtained by dividing the Purchase
Price in effect immediately prior to adjustment of the Purchase Price by the
Purchase Price in effect immediately after adjustment of the Purchase Price. The
Company shall make a public announcement of its election to adjust the number of
Rights, indicating the record date for the adjustment, and, if known at the
time, the amount of the adjustment to be 

                                       15
<PAGE>   19
made. This record date may be the date on which the Purchase Price is adjusted
or any day thereafter, but, if the Right Certificates have been issued, shall be
at least 10 days later than the date of the public announcement. If Right
Certificates have been issued, upon each adjustment of the number of Rights
pursuant to this Section 11(i), the Company shall, as promptly as practicable,
cause to be distributed to holders of record of Right Certificates on such
record date Right Certificates evidencing, subject to Section 14 hereof, the
additional Rights to which such holders shall be entitled as a result of such
adjustment, or, at the option of the Company, shall cause to be distributed to
such holders of record in substitution and replacement for the Right
Certificates held by such holders prior to the date of adjustment, and upon
surrender thereof, if required by the Company, new Right Certificates evidencing
all the Rights to which such holders shall be entitled after such adjustment.
Right Certificates so to be distributed shall be issued, executed and
countersigned in the manner provided for herein and shall be registered in the
names of the holders of record of Right Certificates on the record date
specified in the public announcement.

         (j) Irrespective of any adjustment or change in the Purchase Price or
the number of one one-hundredths of a Preferred Share issuable upon the exercise
of the Rights, the Right Certificates theretofore and thereafter issued may
continue to express the Purchase Price and the number of one one-hundredths of a
Preferred Share which were expressed in the initial Right Certificates issued
hereunder.

         (k) Before taking any action that would cause an adjustment reducing
the Purchase Price below one one-hundredth of the then par value, if any, of the
Preferred Shares issuable upon exercise of the Rights, the Company shall take
any corporate action which may, in the opinion of its counsel, be necessary in
order that the Company may validly and legally issue fully paid and
nonassessable Preferred Shares at such adjusted Purchase Price.

         (1) In any case in which this Section 11 shall require that an
adjustment in the Purchase Price be made effective as of a record date for a
specified event, the Company may elect to defer until the occurrence of such
event the issuing to the holder of any Right exercised after such record date of
the Preferred Shares and other capital stock or securities of the Company, if
any, issuable upon such exercise on the basis of the Purchase Price in effect
prior to such adjustment; provided, however, that the Company shall deliver to
such holder a due bill or other appropriate instrument evidencing such holder's
right to receive such additional shares upon the occurrence of the event
requiring such adjustment.

         (m) Anything in this Section 11 to the contrary notwithstanding, the
Company shall be entitled to make such reductions in the Purchase Price, in
addition to those adjustments expressly required by this Section 11, as and to
the extent that it in its sole discretion shall determine to be advisable in
order that any consolidation or subdivision of the Preferred Shares, issuance
wholly for cash of any Preferred Shares at less than the current per share
market price, issuance wholly for cash of Preferred Shares or securities which
by their terms are convertible into or exchangeable for Preferred Shares,
dividends on Preferred Shares payable in Preferred Shares or issuance of rights,
options or warrants referred to hereinabove in Section 11(b), hereafter made by
the Company to holders of its Preferred Shares shall not be taxable to such
stockholders.

                                       16
<PAGE>   20
         (n) The Company covenants and agrees that it shall not, at any time
after the Distribution Date, (i) consolidate with any other Person, (ii) merge
with or into any other Person, or (iii) sell or transfer (or permit any
Subsidiary to sell or transfer), in one transaction, or a series of related
transactions, assets or earning power aggregating more than 50% of the assets or
earning power of the Company and its Subsidiaries (taken as a whole) to any
other Person or Persons (other than the Company and/or any of its Subsidiaries
in one or more transactions each of which complies with Section 11(o) hereof),
if (x) at the time of or immediately after such consolidation, merger or sale
there are any rights, warrants or other instruments or securities outstanding or
agreements in effect which would substantially diminish or otherwise eliminate
the benefits intended to be afforded by the Rights or (y) prior to,
simultaneously with or immediately after such consolidation, merger or sale, the
shareholders of the Person who constitutes, or would constitute, the "Principal
Party" for purposes of Section 13(a) hereof shall have received a distribution
of Rights previously owned by such Person or any of its Affiliates and
Associates.

         (o) The Company covenants and agrees that, after the Distribution Date,
it will not, except as permitted by Section 23, Section 24 or Section 26 hereof,
take (or permit any Subsidiary to take) any action if at the time such action is
taken it is reasonably foreseeable that such action will diminish substantially
or otherwise eliminate the benefits intended to be afforded by the Rights.

         (p) In the event that at any time after the date of this Agreement and
prior to the Distribution Date, the Company shall (i) declare or pay any
dividend on the Common Shares payable in Common Shares or (ii) effect a
subdivision, combination or consolidation of the Common Shares (by
reclassification or otherwise than by payment of dividends in Common Shares)
into a greater or lesser number of Common Shares, then in any such case (A) the
number of one one-hundredths of a Preferred Share purchasable after such event
upon proper exercise of each Right shall be determined by multiplying the number
of one one-hundredths of a Preferred Share so purchasable immediately prior to
such event by a fraction, the numerator of which is the number of Common Shares
outstanding immediately before such event and the denominator of which is the
number of Common Shares outstanding immediately after such event, and (B) each
Common Share outstanding immediately after such event shall have issued with
respect to it that number of Rights which each Common Share outstanding
immediately prior to such event had issued with respect to it. The adjustments
provided for in this Section 11(p) shall be made successively whenever such a
dividend is declared or paid or such a subdivision, combination or consolidation
is effected.

         Section 12. Certificate of Adjusted Purchase Price or Number of Shares.
Whenever an adjustment is made as provided in Sections 11 and 13 hereof, the
Company shall promptly (a) prepare a certificate setting forth such adjustment,
and a brief statement of the facts accounting for such adjustment, (b) file with
the Rights Agent and with each transfer agent for the Common Shares or the
Preferred Shares a copy of such certificate and (c) mail a brief summary thereof
to each holder of a Right Certificate in accordance with Section 25 hereof. The
Rights Agent shall be fully protected in relying on any such certificate and on
any adjustment therein contained and 

                                       17
<PAGE>   21
shall not be deemed to have knowledge of any adjustment unless and until it
shall have received such certificate.

         Section 13. Consolidation, Merger or Sale or Transfer of Assets or
Earning Power.

         (a) In the event that, following a Section 11(a)(ii) Event, directly or
indirectly (x) the Company shall consolidate with, or merge with and into, any
other Person, (y) any Person shall consolidate with the Company, or merge with
and into the Company, and the Company shall be the continuing or surviving
corporation of such merger (other than, in the case of either transaction
described in (x) or (y), a merger or consolidation which would result in all of
the Voting Power represented by the securities of the Company outstanding
immediately prior thereto continuing to represent (either by remaining
outstanding or by being converted into securities of the surviving entity) all
of the Voting Power represented by the securities of the Company or such
surviving entity outstanding immediately after such merger or consolidation and
the holders of such securities not having changed as a result of such merger or
consolidation), or (z) the Company shall sell, mortgage or otherwise transfer
(or one or more of its Subsidiaries shall sell, mortgage or otherwise transfer),
in one or more transactions, assets or earning power aggregating 50% or more of
the assets or earning power of the Company and its Subsidiaries (taken as a
whole) to any other Person (any such event being a "Section 13 Event"), then,
and in each such case, proper provision shall be made so that (i) following the
Distribution Date, each holder of a Right, subject to Section 7(e), shall have
the right to receive, upon the exercise thereof at a price equal to the then
current Purchase Price multiplied by the number of one one-hundredths of a
Preferred Share for which a Right is then exercisable in accordance with the
terms of this Agreement and in lieu of Preferred Shares, such number of shares
of freely tradeable Common Shares of the Principal Party (as hereinafter
defined), free and clear of liens, rights of call or first refusal, encumbrances
or other adverse claims, as shall be equal to the result obtained by (A)
multiplying the then current Purchase Price by the number of one one-hundredths
of a Preferred Share for which a Right is then exercisable (without taking into
account any adjustment previously made pursuant to Section 11(a)(ii) hereof) and
dividing that product by (B) 50% of the then current per share market price of
the Common Shares of such Principal Party (determined pursuant to Section 11(d)
hereof) on the date of consummation of such consolidation, merger, sale or
transfer; (ii) such Principal Party shall thereafter be liable for, and shall
assume, by virtue of such consolidation, merger, sale or transfer, all the
obligations and duties of the Company pursuant to this Agreement; (iii) the term
"Company" shall thereafter be deemed to refer to such Principal Party, it being
specifically intended that the provisions of Section 11 hereof shall apply to
such Principal Party; and (iv) such Principal Party shall take such steps
(including, but not limited to, the reservation of a sufficient number of shares
of its Common Shares in accordance with Section 9 hereof) in connection with
such consummation as may be necessary to ensure that the provisions hereof shall
thereafter be applicable, as nearly as reasonably may be, in relation to its
Common Shares thereafter deliverable upon the exercise of the Rights.

         (b)    "Principal Party" shall mean:

                                       18
<PAGE>   22
                  (i)  in the case of any transaction described in (x) or (y) of
         the first sentence of Section 13(a), the Person that is the issuer of
         any securities into which Common Shares of the Company are converted in
         such merger or consolidation, and if no securities are so issued, the
         Person that is the other party to the merger or consolidation
         (including, if applicable, the Company, if it is the surviving
         corporation); and

                  (ii) in the case of any transaction described in (z) of the
         first sentence in Section 13(a), the Person that is the party receiving
         the greatest portion of the assets or earning power transferred
         pursuant to such transaction or transactions;

provided, however, that in any case, (1) if the Common Shares of such Person are
not at such time and have not been continuously over the preceding 12-month
period registered under Section 12 of the Exchange Act, and such Person is a
direct or indirect Subsidiary or Affiliate of another Person the Common Shares
of which are and have been so registered, "Principal Party" shall refer to such
other Person; (2) in case such Person is a Subsidiary, directly or indirectly,
or Affiliate of more than one Person, the Common Shares of two or more of which
are and have been so registered, "Principal Party" shall refer to whichever of
such Persons is the issuer of the Common Shares having the greatest aggregate
market value; and (3) in case such Person is owned, directly or indirectly, by a
joint venture formed by two or more Persons that are not owned, directly or
indirectly, by the same Person, the rules set forth in (1) and (2) above shall
apply to each of the chains of ownership having an interest in such joint
venture as if such party were a "Subsidiary" of both or all of such joint
venturers, and the Principal Parties in each such chain shall bear the
obligations set forth in this Section 13 in the same ratio as their direct or
indirect interests in such Person bear to the total of such interests.

         (c) The Company shall not consummate any such consolidation, merger,
sale or transfer unless the Principal Party shall have a sufficient number of
authorized shares of its Common Shares that have not been issued or reserved for
issuance to permit the exercise in full of the Rights in accordance with this
Section 13 and unless prior thereto the Company and each Principal Party and
each other Person who may become a Principal Party as a result of such
consolidation, merger, sale or transfer shall have executed and delivered to the
Rights Agent a supplemental agreement providing for the terms set forth in
paragraphs (a) and (b) of this Section 13 and further providing that, as soon as
practicable after the date of any consolidation, merger, sale or transfer of
assets mentioned in paragraph (a) of this Section 13, the Principal Party at its
own expense will:

                  (i)  prepare and file a registration statement under the
         Securities Act of 1933, as amended (the "Act"), with respect to the
         Rights and the securities purchasable upon exercise of the Rights on an
         appropriate form, will use its best efforts to cause such registration
         statement to become effective as soon as practicable after such filing
         and will use its best efforts to cause such registration statement to
         remain effective (with a prospectus at all times meeting the
         requirements of the Act) until the Expiration Date;

                                       19
<PAGE>   23
                  (ii)  use its best efforts to qualify or register the Rights
         and the securities purchasable upon exercise of the Rights under the
         blue sky laws of such jurisdictions as may be necessary or appropriate;
         and

                  (iii) deliver to holders of the Rights historical financial
         statements for the Principal Party and each of its Affiliates which
         comply in all material respects with the requirements for registration
         on Form 10 under the Exchange Act.

The provisions of this Section 13 shall similarly apply to successive mergers or
consolidations or sales or other transfers.

         (d) In case the Principal Party which is to be a party to a transaction
referred to in this Section 13 has a provision in any of its authorized
securities or in its certificate of incorporation or bylaws or other instrument
governing its corporate affairs, which provision would have the effect of (i)
causing such Principal Party to issue, in connection with, or as a consequence
of, the consummation of a transaction referred to in this Section 13, Common
Shares of such Principal Party at less than the then current per share market
price (determined pursuant to Section 11(d) hereof) or securities exercisable
for, or convertible into, Common Shares of such Principal Party at less than
such then current per share market price (other than to holders of Rights
pursuant to this Section 13) or (ii) providing for any special payment, tax or
similar provisions in connection with the issuance of the Common Shares of such
Principal Party pursuant to the provisions of this Section 13; then, in such
event, the Company shall not consummate any such transaction unless prior
thereto the Company and such Principal Party shall have executed and delivered
to the Rights Agent a supplemental agreement providing that the provision in
question of such Principal Party shall have been cancelled, waived or amended,
or that the authorized securities shall be redeemed, so that the applicable
provision will have no effect in connection with, or as a consequence of, the
consummation of the proposed transaction.

         (e) Notwithstanding anything in this Agreement to the contrary, Section
13 shall not be applicable to a transaction described in clauses (x) and (y) of
Section 13(a) if (i) such transaction is consummated with a Person or Persons
(or a wholly owned subsidiary of any such Person or Persons) who acquired Common
Shares pursuant to a Qualifying Offer, (ii) the price per share of Common Shares
offered in such transaction is not less than the price per Common Share paid to
all holders of shares of Common Shares whose shares were purchased pursuant to
such tender offer or exchange offer and (iii) the form of consideration being
offered to the remaining holders of Common Shares pursuant to such transaction
is the same as the form of consideration paid pursuant to such tender offer or
exchange offer. Upon consummation of any such transaction contemplated by this
Section 13(e), all Rights hereunder shall expire.

         Section 14. Fractional Rights and Fractional Shares.

         (a) The Company shall not be required to issue fractions of Rights or
to distribute Right Certificates which evidence fractional Rights. In lieu of
such fractional Rights, there shall be paid to the registered holders of the
Right Certificates with regard to which such fractional Rights would otherwise
be issuable, an amount in cash equal to the same fraction of the current market
value of a whole Right. For the purposes of this Section 14(a), the current
market value of a 

                                       20
<PAGE>   24
whole Right shall be the closing price of the Rights for the Trading Day
immediately prior to the date on which such fractional Rights would have been
otherwise issuable. The closing price for any day shall be the last sale price,
regular way, or, in case no such sale takes place on such day, the average of
the closing bid and asked prices, regular way, in either case as reported in the
principal consolidated transaction reporting system with respect to securities
listed or admitted to trading on the New York Stock Exchange or, if the Rights
are not listed or admitted to trading on the New York Stock Exchange, as
reported in the principal consolidated transaction reporting system with respect
to securities listed on the principal national securities exchange on which the
Rights are listed or admitted to trading or, if the Rights are not listed or
admitted to trading on any national securities exchange, the last quoted price
or, if not so quoted, the average of the high bid and low asked prices in the
over-the-counter market, as reported by NASDAQ or such other system then in use
or, if on any such date the Rights are not quoted by any such organization, the
average of the closing bid and asked prices as furnished by a professional
market maker making a market in the Rights selected by the Board of Directors of
the Company. If on any such date no such market maker is making a market in the
Rights, the fair value of the Rights on such date as determined in good faith by
the Board of Directors of the Company shall be used.

         (b) The Company shall not be required to issue fractions of Preferred
Shares (other than fractions which are integral multiples of one one-hundredth
of a Preferred Share) upon exercise of the Rights or to distribute certificates
which evidence fractional Preferred Shares (other than fractions which are
integral multiples of one one-hundredth of a Preferred Share). Fractions of
Preferred Shares in integral multiples of one one-hundredth of a Preferred Share
may, at the election of the Company, be evidenced by depository receipts;
provided, however, that holders of such depository receipts shall have all of
the rights, privileges and preferences to which they are entitled as beneficial
owners of the Preferred Shares represented by such depository receipts. In lieu
of fractional Preferred Shares that are not integral multiples of one
one-hundredth of a Preferred Share, the Company shall pay to the registered
holders of Right Certificates at the time such Rights are exercised as herein
provided an amount in cash equal to the same fraction of the current market
value of one Preferred Share. For the purposes of this Section 14(b), the
current market value of a Preferred Share shall be the closing price of a
Preferred Share (as determined pursuant to the second sentence of Section
11(d)(i) hereof) for the Trading Day immediately prior to the date of such
exercise.

         (c) The holder of a Right by the acceptance of the Right expressly
waives his right to receive any fractional Rights or any fractional shares upon
exercise of a Right (except as provided above).

         Section 15. Rights of Action. All rights of action in respect of this
Agreement, excepting the rights of action given to the Rights Agent under
Sections 18 and 20 hereof, are vested in the respective registered holders of
the Right Certificates (and, prior to the Distribution Date, the registered
holders of the Common Shares), and any registered holder of any Right
Certificate (or, prior to the Distribution Date, of the Common Shares), without
the consent of the Rights Agent or of the holder of any other Right Certificate
(or, prior to the Distribution Date, of the Common Shares), may, in his own
behalf and for his own benefit, enforce, and may institute and maintain any
suit, action or proceeding against the Company to enforce, or otherwise act in
respect of, his 

                                       21
<PAGE>   25
right to exercise the Rights evidenced by such Right Certificate in the manner
provided in such Right Certificate and in this Agreement. Without limiting the
foregoing or any remedies available to the holders of Rights, it is specifically
acknowledged that the holders of Rights would not have an adequate remedy at law
for any breach of this Agreement and will be entitled to specific performance of
the obligations under, and injunctive relief against actual or threatened
violations of the obligations of any Person subject to, this Agreement. Holders
of Rights shall be entitled to recover the reasonable costs and expenses,
including attorneys' fees, incurred by them in any action to enforce the
provisions of this Agreement.

         Section 16. Agreement of Right Holders. Every holder of a Right, by
accepting the same, consents and agrees with the Company and the Rights Agent
and with every other holder of a Right that:

         (a) prior to the Distribution Date, the Rights will be transferable
only in connection with the transfer of the Common Shares;

         (b) after the Distribution Date, the Right Certificates are
transferable only on the registry books of the Rights Agent if surrendered at
the principal office of the Rights Agent, duly endorsed or accompanied by a
proper instrument of transfer; and

         (c) the Company and the Rights Agent may deem and treat the person in
whose name the Right Certificate (or, prior to the Distribution Date, the
associated Common Shares certificate) is registered as the absolute owner
thereof and of the Rights evidenced thereby (notwithstanding any notations of
ownership or writing on the Right Certificates or the associated Common Shares
certificate made by anyone other than the Company or the Rights Agent) for all
purposes whatsoever, and neither the Company nor the Rights Agent shall be
affected by any notice to the contrary.

         Section 17. Right Certificate Holder Not Deemed a Stockholder. No
holder, as such, of any Right Certificate shall be entitled to vote, receive
dividends or be deemed for any purpose the holder of the Preferred Shares or any
other securities of the Company which may at any time be issuable on the
exercise of the Rights represented thereby, nor shall anything contained herein
or in any Right Certificate be construed to confer upon the holder of any Right
Certificate, as such, any of the rights of a stockholder of the Company or any
right to vote for the election of directors or upon any matter submitted to
stockholders at any meeting thereof, or to give or withhold consent to any
corporate action, or to receive notice of meetings or other actions affecting
stockholders (except as provided in Section 25 hereof), or to receive dividends
or subscription rights, or otherwise, until the Right or Rights evidenced by
such Right Certificate shall have been exercised in accordance with the
provisions hereof.

         Section 18. Concerning the Rights Agent. The Company agrees to pay to
the Rights Agent reasonable compensation for all services rendered by it
hereunder and, from time to time, on demand of the Rights Agent, its reasonable
expenses and counsel fees and other disbursements incurred in the administration
and execution of this Agreement and the exercise and performance of its duties
hereunder. The Company also agrees to indemnify the Rights Agent for, and to
hold it harmless against, any loss, liability, or expense, incurred without

                                       22
<PAGE>   26
negligence, bad faith or willful misconduct on the part of the Rights Agent, for
anything done or omitted by the Rights Agent in connection with the acceptance
and administration of this Agreement, including the costs and expenses of
defending against any claim of liability in the premises. The indemnity provided
herein shall survive the expiration of the Rights and the termination of this
Agreement.

         The Rights Agent shall be protected and shall incur no liability for,
or in respect of any action taken, suffered or omitted by it in connection with,
its administration of this Agreement in reliance upon any Right Certificate or
certificate for the Preferred Shares or Common Shares or for other securities of
the Company, instrument of assignment or transfer, power of attorney,
endorsement, affidavit, letter, notice, direction, consent, certificate,
statement, or other paper or document believed by it to be genuine and to be
signed, executed and, where necessary, verified or acknowledged, by the proper
person or persons, or otherwise upon the advice of counsel as set forth in
Section 20 hereof.

         Section 19. Merger or Consolidation or Change of Name of Rights Agent.
Any corporation into which the Rights Agent or any successor Rights Agent may be
merged or with which it may be consolidated, or any corporation resulting from
any merger or consolidation to which the Rights Agent or any successor Rights
Agent shall be a party, or any corporation succeeding to the shareholder
services or corporate trust business of the Rights Agent or any successor Rights
Agent, shall be the successor to the Rights Agent under this Agreement without
the execution or filing of any paper or any further act on the part of any of
the parties hereto, provided that such corporation would be eligible for
appointment as a successor Rights Agent under the provisions of Section 21
hereof. In case at the time such successor Rights Agent shall succeed to the
agency created by this Agreement any of the Right Certificates shall have been
countersigned but not delivered, any such successor Rights Agent may adopt the
countersignature of the predecessor Rights Agent and deliver such Right
Certificates so countersigned; and in case at that time any of the Right
Certificates shall not have been countersigned, any successor Rights Agent may
countersign such Right Certificates either in the name of the predecessor Rights
Agent or in the name of the successor Rights Agent; and in all such cases such
Right Certificates shall have the full force provided in the Right Certificates
and in this Agreement.

         In case at any time the name of the Rights Agent shall be changed and
at such time any of the Right Certificates shall have been countersigned but not
delivered, the Rights Agent may adopt the countersignature under its prior name
and deliver Right Certificates so countersigned; and in case at that time any of
the Right Certificates shall not have been countersigned, the Rights Agent may
countersign such Right Certificates either in its prior name or in its changed
name; and in all such cases such Right Certificates shall have the full force
provided in the Right Certificates and in this Agreement.

         Section 20. Duties of Rights Agent. The Rights Agent undertakes the
duties and obligations imposed by this Agreement upon the following terms and
conditions, by all of which the Company and the holders of Right Certificates,
by their acceptance thereof, shall be bound:

                                       23
<PAGE>   27
         (a) The Rights Agent may consult with legal counsel of its choice (who
may be legal counsel for the Company), and the opinion of such counsel shall be
full and complete authorization and protection to the Rights Agent as to any
action taken or omitted by it in good faith and in accordance with such opinion.

         (b) Whenever in the performance of its duties under this Agreement the
Rights Agent shall deem it necessary or desirable that any fact or matter be
proved or established by the Company prior to taking or suffering any action
hereunder, such fact or matter (unless other evidence in respect thereof be
herein specifically prescribed) may be deemed to be conclusively proved and
established by a certificate signed by any one of the Chairman of the Board, the
Chief Executive Officer, the President, the Chief Financial Officer, any Vice
President, the Treasurer or the Secretary of the Company and delivered to the
Rights Agent; and such certificate shall be full authorization to the Rights
Agent for any action taken or suffered in good faith by it under the provisions
of this Agreement in reliance upon such certificate.

         (c) The Rights Agent shall be liable hereunder to the Company and any
other Person only for its own negligence, bad faith or willful misconduct.

         (d) The Rights Agent shall not be liable for or by reason of any of the
statements of fact or recitals contained in this Agreement or in the Right
Certificates (except its countersignature thereof) or be required to verify the
same, but all such statements and recitals are and shall be deemed to have been
made by the Company only.

         (e) The Rights Agent shall not be under any responsibility in respect
of the validity of this Agreement or the execution and delivery hereof (except
the due execution hereof by the Rights Agent) or in respect of the validity or
execution of any Right Certificate (except its countersignature thereof); nor
shall it be responsible for any breach by the Company of any covenant or
condition contained in this Agreement or in any Right Certificate; nor shall it
be responsible for any change in the exercisability of the Rights (including the
Rights becoming void pursuant to Section 11(a)(ii) hereof) or any adjustment in
the terms of the Rights (including the manner, method or amount thereof)
provided for in Section 3, 11, 13, 23 or 24, or the ascertaining of the
existence of facts that would require any such change or adjustment (except with
respect to the exercise of Rights evidenced by Right Certificates after receipt
of a certificate pursuant to Section 12 describing such change or adjustment);
nor shall it by any act hereunder be deemed to make any representation or
warranty as to the authorization or reservation of any Preferred Shares to be
issued pursuant to this Agreement or any Right Certificate or as to whether any
Preferred Shares will, when issued, be validly authorized and issued, fully paid
and nonassessable.

         (f) The Company agrees that it will perform, execute, acknowledge and
deliver or cause to be performed, executed, acknowledged and delivered all such
further and other acts, instruments and assurances as may reasonably be required
by the Rights Agent for the carrying out or performing by the Rights Agent of
the provisions of this Agreement.

         (g) The Rights Agent is hereby authorized and directed to accept
instructions with respect to the performance of its duties hereunder from any
one of the Chairman of the Board, 

                                       24
<PAGE>   28
the Chief Executive Officer, the President, the Chief Financial Officer, any
Vice President, the Secretary or the Treasurer of the Company, and to apply to
such officers for advice or instructions in connection with its duties, and it
shall not be liable for any action taken or suffered by it in good faith in
accordance with instructions of any such officer or for any delay in acting
while waiting for those instructions. Any application by the Rights Agent for
written instructions from the Company may, at the option of the Rights Agent,
set forth in writing any action proposed to be taken or omitted by the Rights
Agent with respect to its duties or obligations under this Rights Agreement and
the date on and/or after which such action shall be taken or omitted, and the
Rights Agent shall not be liable for any action taken or omitted in accordance
with a proposal included in any such application on or after the date specified
therein (which date shall not be less than three business days after the date
any such officer shall have consented in writing to an earlier date) unless,
prior to taking or omitting any such action, the Rights Agent has received
written instructions in response to such application specifying the action to be
taken or omitted.

         (h) The Rights Agent and any stockholder, director, officer or employee
of the Rights Agent may buy, sell or deal in any of the Rights or other
securities of the Company or become pecuniarily interested in any transaction in
which the Company may be interested, or contract with or lend money to the
Company or otherwise act as fully and freely as though it were not Rights Agent
under this Agreement. Nothing herein shall preclude the Rights Agent from acting
in any other capacity for the Company or for any other legal entity.

         (i) The Rights Agent may execute and exercise any of the rights or
powers hereby vested in it or perform any duty hereunder either itself or by or
through its attorneys or agents, and the Rights Agent shall not be answerable or
accountable for any act, default, neglect or misconduct of any such attorneys or
agents or for any loss to the Company resulting from any such act, default,
neglect or misconduct, provided reasonable care was exercised in the selection
and continued employment thereof.

         (j) No provision of this Agreement shall require the Rights Agent to
expend or risk its own funds or otherwise incur any financial liability in the
performance of any of its duties hereunder or in the exercise of its rights if
there shall be reasonable grounds for believing that repayment of such funds or
adequate indemnification against such risk or liability is not reasonably
assured to it.

         (k) If, with respect to any Right Certificate surrendered to the Rights
Agent for exercise or transfer, the certificate attached to the form of
assignment or form of election to purchase, as the case may be, has not been
executed, the Rights Agent shall not take any further action with respect to
such requested exercise of transfer without first consulting with the Company.

         Section 21. Change of Rights Agent. The Rights Agent or any successor
Rights Agent may resign and be discharged from its duties under this Agreement
upon 30 days' notice in writing mailed to the Company and to each transfer agent
for the Common Shares or Preferred Shares by registered or certified mail, and
to the holders of the Right Certificates by first-class mail. The Company may
remove the Rights Agent or any successor Rights Agent upon 30 days' 

                                       25
<PAGE>   29
notice in writing, mailed to the Rights Agent or successor Rights Agent, as the
case may be, and to each transfer agent for the Common Shares or Preferred
Shares by registered or certified mail, and to the holders of the Right
Certificates by first-class mail. If the Rights Agent shall resign or be removed
or shall otherwise become incapable of acting, the Company shall appoint a
successor to the Rights Agent. If the Company shall fail to make such
appointment within a period of 30 days after giving notice of such removal or
after it has been notified in writing of such resignation or incapacity by the
resigning or incapacitated Rights Agent or by the holder of a Right Certificate
(who shall, with such notice, submit his Right Certificate for inspection by the
Company), then the registered holder of any Right Certificate may apply to any
court of competent jurisdiction for the appointment of a new Rights Agent. Any
successor Rights Agent, whether appointed by the Company or by such a court,
shall be a corporation organized and doing business under the laws of the United
States or of any other state of the United States which is authorized under such
laws to exercise corporate trust or stock transfer powers and is subject to
supervision or examination by federal or state authority and which has at the
time of its appointment as Rights Agent a combined capital and surplus of at
least $50 million. After appointment, the successor Rights Agent shall be vested
with the same powers, rights, duties and responsibilities as if it had been
originally named as Rights Agent without further act or deed; but the
predecessor Rights Agent shall deliver and transfer to the successor Rights
Agent any property at the time held by it hereunder, and execute and deliver any
further assurance, conveyance, act or deed necessary for the purpose. Not later
than the effective date of any such appointment the Company shall file notice
thereof in writing with the predecessor Rights Agent and each transfer agent for
the Common Shares or Preferred Shares, and mail a notice thereof in writing to
the registered holders of the Right Certificates. Failure to give any notice
provided for in this Section 21, however, or any defect therein, shall not
affect the legality or validity of the resignation or removal of the Rights
Agent or the appointment of the successor Rights Agent, as the case may be.

         Section 22. Issuance of New Right Certificates. Notwithstanding any of
the provisions of this Agreement or of the Rights to the contrary, the Company
may, at its option, issue new Right Certificates evidencing Rights in such form
as may be approved by its Board of Directors to reflect any adjustment or change
in the Purchase Price and the number or kind or class of shares or other
securities or property purchasable under the Right Certificates made in
accordance with the provisions of this Agreement.

         Section 23. Redemption.

         (a) The Board of Directors of the Company may, at its option, at any
time prior to the earlier of (i) the Close of Business on the tenth day
following a Section 11(a)(ii) Event (or, if the Section 11(a)(ii) Event shall
have occurred prior to the Record Date, the Close of Business on the tenth day
following the Record Date), or (ii) the Final Expiration Date, redeem all but
not less than all the then outstanding Rights at a redemption price of $.001 per
Right, as such amount may be appropriately adjusted to reflect any stock split,
stock dividend or similar transaction occurring after the date hereof (such
redemption price being hereinafter referred to as the "Redemption Price");
provided, however, if the Board of Directors of the Company authorizes
redemption of the Rights in either of the circumstances set forth in clauses (i)
and (ii) below, then 

                                       26
<PAGE>   30
there must be an Incumbent Board then in office and such authorization shall
require the concurrence of a majority of such Incumbent Board: (i) such
authorization occurs on or after the time of the occurrence of a Section
11(a)(ii) Event, or (ii) such authorization occurs on or after the date of a
change (resulting from a proxy or consent solicitation) in a majority of the
directors in office at the commencement of such solicitation if any Person who
is a participant in such solicitation has stated (or, if upon the commencement
of such solicitation, a majority of the Board of Directors of the Company has
determined in good faith) that such Person (or any of its Affiliates or
Associates) intends to take, or may consider taking, any action which would
result in such Person becoming an Acquiring Person or which would cause the
occurrence of a Triggering Event. Notwithstanding anything contained in this
Agreement to the contrary, the Rights shall not be exercisable after the first
occurrence of a Section 11(a)(ii) Event until such time as the Company's right
of redemption hereunder has expired. The Company may, at its option, pay the
Redemption Price in cash, Common Shares (based on the "current per share market
price" (as determined pursuant to Section 11(d) hereof) of the Common Shares at
the time of redemption) or any other form of consideration deemed appropriate by
the Board of Directors.

         (b) Immediately upon the action of the Board of Directors of the
Company ordering the redemption of the Rights pursuant to subsection (a) of this
Section 23, and without any further action and without any notice, the right to
exercise the Rights will terminate and the only right thereafter of the holders
of Rights shall be to receive the Redemption Price. The Company shall promptly
give public notice of any such redemption; provided, however, that the failure
to give, or any defect in, any such notice shall not affect the validity of such
redemption. Within 10 days after such action of the Board of Directors ordering
the redemption of the Rights pursuant to subsection (a) the Company shall mail a
notice of redemption to all the holders of the then outstanding Rights at their
last addresses as they appear upon the registry books of the Rights Agent or,
prior to the Distribution Date, on the registry books of the transfer agent for
the Common Shares. Any notice which is mailed in the manner herein provided
shall be deemed given, whether or not the holder receives the notice. Each such
notice of redemption will state the method by which the payment of the
Redemption Price will be made. Neither the Company nor any of its Affiliates or
Associates may redeem, acquire or purchase for value any Rights at any time in
any manner other than that specifically set forth in this Section 23 or in
Section 24 hereof, and other than in connection with the purchase of Common
Shares prior to the Distribution Date.

         (c) The Company may, at its option, discharge all of its obligations
with respect to the Rights by (i) issuing a press release announcing the manner
of redemption of the Rights and (ii) mailing payment of the Redemption Price to
the registered holders of the Rights at their last addresses as they appear on
the registry books of the Rights Agent or, prior to the Distribution Date, on
the registry books of the transfer agent for the Common Shares, and upon such
action, all outstanding Right Certificates shall be null and void without any
further action by the Company.

                                       27
<PAGE>   31
         Section 24. Exchange.

         (a) The Board of Directors of the Company (including a majority of the
Incumbent Board) may, at its option, at any time after any Person becomes an
Acquiring Person, exchange all or part of the then outstanding and exercisable
Rights (which shall not include Rights that have become void pursuant to the
provisions of Section 11(a)(ii) hereof) for Common Shares at an exchange ratio
of one Common Share per Right, appropriately adjusted to reflect any stock
split, stock dividend or similar transaction occurring after the date hereof
(such exchange ratio being hereinafter referred to as the "Exchange Ratio").
Notwithstanding the foregoing, the Board of Directors shall not be empowered to
effect such exchange at any time after any Person (other than the Company, any
Subsidiary of the Company, any employee benefit plan of the Company or any such
Subsidiary, or any entity holding Common Shares for or pursuant to the terms of
any such plan), together with all Affiliates and Associates of such Person,
becomes the Beneficial Owner of 50% or more of the Common Shares then
outstanding.

         (b) Immediately upon the action of the Board of Directors of the
Company (including a majority of the Incumbent Board) ordering the exchange of
any Rights pursuant to subsection (a) of this Section 24 and without any further
action and without any notice, the right to exercise such Rights shall
terminate, and the only right thereafter of a holder of such Rights shall be to
receive that number of Common Shares equal to the number of such Rights held by
such holder multiplied by the Exchange Ratio. The Company shall promptly give
public notice of any such exchange; provided, however, that the failure to give,
or any defect in, such notice shall not affect the validity of such exchange.
The Company promptly shall mail a notice of any such exchange to all of the
holders of such Rights at their last addresses as they appear upon the registry
books of the Rights Agent. Any notice which is mailed in the manner herein
provided shall be deemed given, whether or not the holder receives the notice.
Each such notice of exchange will state the method by which the exchange of the
Common Shares for Rights will be effected and, in the event of any partial
exchange, the number of Rights which will be exchanged. Any partial exchange
shall be effected pro rata based on the number of Rights (other than Rights
which have become void pursuant to the provisions of Section 11(a)(ii) hereof)
held by each holder of Rights.

         (c) In the event that there shall not be sufficient Common Shares
issued but not outstanding or authorized but unissued to permit any exchange of
Rights as contemplated in accordance with this Section 24, the Board of
Directors, if the Board of Directors determine that such action is necessary or
appropriate and not contrary to the interests of the holders of Rights, may, but
shall not be required to, with respect to each Right, (A) take all such action
as may be necessary to authorize additional Common Shares for issuance upon
exchange of the Rights, or (B) pay cash in an amount equal to the current per
share market price of one Common Share (determined pursuant to Section 11(d) on
the date of the occurrence of the event described in Section 11(a)(ii)) in
exchange for each Right, in lieu of issuing Common Shares, or (C) issue debt or
equity securities (including, without limitation, shares, or fractions of
shares, of preferred stock, including Preferred Shares, which the Board of
Directors has deemed to have the same value as Common Shares) or a combination
thereof, having a value equal to the current per share market price of one
Common Share (determined pursuant to Section 11(d) on the date of the  

                                       28
<PAGE>   32
occurrence of a Section 11(a)(ii) Event where the value of such securities shall
be determined by a nationally recognized investment banking firm selected by the
Board of Directors of the Company, in exchange for each Right, or (D) deliver
any combination of cash, property, Common Shares and/or other securities having
a value equal to the current per share market price of one Common Share
(determined pursuant to Section 11(d) on the date of the occurrence of the event
described in Section 11(b)(ii)) in exchange for each Right. To the extent that
the Company determines that some action need be taken pursuant to clause (A),
(B), (C) or (D) of this Section 24(c), the Board of Directors may temporarily
suspend the exercisability of the Rights for a period of up to 45 days following
the date of the occurrence of a Section 11(a)(ii) Event in order to seek any
authorization of additional Common Shares and/or to decide the appropriate form
of distribution to be made pursuant to the above provision and to determine the
value thereof. In the event of any such suspension, the Company shall issue a
public announcement stating that the exercisability of the Rights has been
temporarily suspended.

         (d) The Company shall not be required to issue fractions of Common
Shares or to distribute certificates which evidence fractional Common Shares. In
lieu of such fractional Common Shares, the Company shall pay to the registered
holders of the Right Certificates with regard to which such fractional Common
Shares would otherwise be issuable an amount in cash equal to the same fraction
of the current market value of a whole Common Share. For the purposes of this
subsection (d), the current market value of a whole Common Share shall be the
closing price of a Common Share (as determined pursuant to the second sentence
of Section 11(d)(i) hereof) for the Trading Day immediately after the date of
the first public announcement by the Company that an exchange is to be effected
pursuant to this Section 24.

         (e) The Company shall not be required to issue fractions of Preferred
Shares (other than fractions which are integral multiples of one one-hundredth
of a Preferred Share) upon exchange of the Rights or to distribute certificates
which evidence fractional Preferred Shares (other than fractions which are
integral multiples of one one-hundredth of a Preferred Share). Fractions of
Preferred Shares in integral multiples of one one-hundredth of a Preferred Share
may, at the election of the Company, be evidenced by depository receipts;
provided, however, that holders of such depository receipts shall have all of
the rights, privileges and preferences to which they are entitled as beneficial
owners of the Preferred Shares represented by such depository receipts. In lieu
of fractional Preferred Shares that are not integral multiples of one
one-hundredth of a Preferred Share, the Company shall pay to the registered
holders of Right Certificates at the time such Rights are exercised as herein
provided an amount in cash equal to the same fraction of the current market
value of one Preferred Share. For the purposes of this Section 24(e), the
current market value of a Preferred Share shall be the closing price of a
Preferred Share (as determined pursuant to the second sentence of Section
11(d)(i) hereof) for the Trading Day immediately after the date of the first
public announcement by the Company that an exchange is to be effected pursuant
to this Section 24.

         Section 25. Notice of Certain Events.

         (a) In case the Company shall propose, at any time on or after the
Distribution Date, (i) to pay any dividend payable in stock of any class to the
holders of its Preferred Shares or to make 

                                       29
<PAGE>   33
any other distribution to the holders of its Preferred Shares (other than a
regular quarterly cash dividend), (ii) to offer to the holders of its Preferred
Shares rights or warrants to subscribe for or to purchase any additional
Preferred Shares or shares of stock of any class or any other securities, rights
or options, (iii) to effect any reclassification of its Preferred Shares (other
than a reclassification involving only the subdivision of outstanding Preferred
Shares), (iv) to effect any consolidation or merger into or with, or to effect
any sale or other transfer (or to permit one or more of its Subsidiaries to
effect any sale or other transfer), in one or more transactions, of 50% or more
of the assets or earning power of the Company and its Subsidiaries (taken as a
whole), to any other Person, (v) to effect the liquidation, dissolution or
winding up of the Company, or (vi) to declare or pay any dividend on the Common
Shares payable in Common Shares or to effect a subdivision, combination or
consolidation of the Common Shares (by reclassification or otherwise than by
payment of dividends in Common Shares), then, in each such case, the Company
shall give to each holder of a Right Certificate, in accordance with Section 26
hereof, a notice of such proposed action, which shall specify the record date
for the purpose of such stock dividend, or distribution of rights or warrants,
or the date on which such reclassification, consolidation, merger, sale,
transfer, liquidation, dissolution, or winding up is to take place and the date
of participation therein by the holders of the Common Shares and/or the
Preferred Shares, if any such date is to be fixed, and such notice shall be so
given in the case of any action covered by clause (i) or (ii) above at least 10
days prior to the record date for determining holders of the Preferred Shares
for purposes of such action, and in the case of any such other action, at least
10 days prior to the date of the taking of such proposed action or the date of
participation therein by the holders of the Common Shares and/or the Preferred
Shares, whichever shall be the earlier.

         (b) In case of a Section 11(a)(ii) Event, the Company shall as soon as
practicable thereafter give to each holder of a Right Certificate, in accordance
with Section 26 hereof, a notice of the occurrence of such event, which notice
shall describe the event and the consequences of the event to holders of Rights
under Section 11(a)(ii) hereof.

         Section 26. Notices. Notices or demands authorized by this Agreement to
be given or made by the Rights Agent or by the holder of any Right Certificate
to or on the Company shall be sufficiently given or made if sent by first-class
mail, postage prepaid, addressed (until another address is filed in writing with
the Rights Agent) as follows:

                  Nellcor Puritan Bennett Incorporated
                  4280 Hacienda Drive
                  Pleasanton, California  94588
                  Attention: General Counsel and Secretary

         Subject to the provisions of Section 21 hereof, any notice or demand
authorized by this Agreement to be given or made by the Company or by the holder
of any Right Certificate to or on the Rights Agent shall be sufficiently given
or made if sent by first-class mail, postage prepaid, addressed (until another
address is filed in writing with the Company) as follows:

                  The First National Bank of Boston

                                       30
<PAGE>   34
                  Blue Hills Office Park
                  Mail Stop: 45-02-16
                  150 Royall Street
                  Canton, MA  02021
                  Attention: Shareholder Services Division

Notices or demands authorized by this Agreement to be given or made by the
Company or the Rights Agent to the holder of any Right Certificate shall be
sufficiently given or made if sent by first-class mail, postage prepaid,
addressed to such holder at the address of such holder as shown on the registry
books of the Company.

         Section 27. Supplements and Amendments. The Company may from time to
time supplement or amend this Agreement without the approval of any holders of
Right Certificates in order to cure any ambiguity, to correct or supplement any
provision contained herein which may be defective or inconsistent with any other
provisions herein, or to make any other provisions with respect to the Rights
which the Company may deem necessary or desirable, any such supplement or
amendment to be evidenced by a writing signed by the Company and the Rights
Agent; provided, however, that from and after such time as any Person becomes an
Acquiring Person, this Agreement shall not be amended in any manner which would
adversely affect the interests of the holders of Rights (other than an Acquiring
Person); and, provided further, however, that following the first occurrence of
an event set forth in clause (i) or (ii) of the first proviso to Section 23(a),
any amendment or modification of this Agreement shall be effective only with the
concurrence of a majority of the Incumbent Board. Without limiting the
foregoing, the Company may at any time prior to such time as any Person becomes
an Acquiring Person amend this Agreement to lower the thresholds set forth in
Sections 1(a) and 3(a) hereof from 15% to any percentage which is (i) greater
than the largest percentage of the outstanding Common Shares then known by the
Company to be beneficially owned by any Person (other than the Company, any
Subsidiary of the Company, any employee benefit plan of the Company or any
Subsidiary, or any entity holding Common Shares for or pursuant to the terms of
any such plan) and (ii) not less than 10%. Upon delivery of a certificate from
an appropriate officer of the Company which states that the proposed supplement
or amendment is in compliance with the terms of this Section 27, the Rights
Agent shall execute such supplement or amendment unless the Rights Agent shall
have determined in good faith that such supplement or amendment would adversely
affect its interest under this Agreement. Prior to the Distribution Date, the
interests of the holders of Rights shall be deemed coincident with the interests
of the holders of Common Shares.

         Section 28. Determination and Actions by the Board of Directors, etc.
For all purposes of this Agreement, any calculation of the number of Common
Shares outstanding at any particular time, including for purposes of determining
the particular percentage of such outstanding Common Shares or any other
securities of which any Person is the Beneficial Owner, shall be made in
accordance with the last sentence of Rule 13d-3(d)(1)(i) of the General Rules
and Regulations under the Exchange Act as in effect on the date of this
Agreement. The Board of Directors of the Company (with, where specifically
provided for herein, the concurrence of a majority of the Incumbent Board) shall
have the exclusive power and authority to administer this 

                                       31
<PAGE>   35
Agreement and to exercise all rights and powers specifically granted to the
Board, or the Company, or as may be necessary or advisable in the administration
of this Agreement, including without limitation, the right and power to (i)
interpret the provisions of this Agreement, and (ii) make all determinations
deemed necessary or advisable for the administration of this Agreement
(including a determination to redeem or not redeem the Rights or to amend the
Agreement). All such actions, calculations, interpretations and determinations
(including, for purposes of clause (y) below, all omissions with respect to the
foregoing) which are done or made by the Board (with, where specifically
provided for herein, the concurrence of a majority of the Incumbent Board) in
good faith, shall (x) be final, conclusive and binding on the Rights Agent and
the holders of the Right Certificates, and (y) not subject the Board to any
liability to the holders of the Right Certificates. There shall at all times be
at least one director constituting the Incumbent Board.

         Section 29. Successors. All the covenants and provisions of this
Agreement by or for the benefit of the Company or the Rights Agent shall bind
and inure to the benefit of their respective successors and assigns hereunder.

         Section 30. Benefits of This Agreement. Nothing in this Agreement shall
be construed to give to any person or corporation other than the Company, the
Rights Agent and the registered holders of the Right Certificates (and, prior to
the Distribution Date, the Common Shares) any legal or equitable right, remedy
or claim under this Agreement; but this Agreement shall be for the sole and
exclusive benefit of the Company, the Rights Agent and the registered holders of
the Right Certificates (and, prior to the Distribution Date, the Common Shares).

         Section 31. Severability. If any term, provision, covenant or
restriction of this Agreement is held by a court of competent jurisdiction or
other authority to be invalid, void or unenforceable, the remainder of the
terms, provisions, covenants and restrictions of this Agreement shall remain in
full force and effect and shall in no way be affected, impaired or invalidated.

         Section 32. Governing Law. This Agreement and each Right Certificate
issued hereunder shall be deemed to be a contract made under the laws of the
State of Delaware and for all purposes shall be governed by and construed in
accordance with the laws of such State applicable to contracts to be made and
performed entirely within such State.

         Section 33. Counterparts. This Agreement may be executed in any number
of counterparts, and each of such counterparts shall for all purposes be deemed
to be an original, and all such counterparts shall together constitute but one
and the same instrument.

         Section 34. Descriptive Headings. Descriptive headings of the several
Sections of this Agreement are inserted for convenience only and shall not
control or affect the meaning or construction of any of the provisions hereof.

                                       32
<PAGE>   36
         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed and their seals attested, all as of the day and year first above
written.

                                               NELLCOR PURITAN BENNETT 
                                               INCORPORATED

Attest:

By: /s/ Edward Lopez                           By: /s/ Laureen DeBuono
    ------------------------------------           -----------------------------
Title:  Assistant Secretary                    Title:  Executive Vice President,
                                                       Human Resources, General
                                                       Counsel and Secretary



                                               THE FIRST NATIONAL BANK OF BOSTON

Attest:

By:  /s/ Diane P. Knutson                      By:  /s/ Geoffrey D. Anderson
    ------------------------------------           -----------------------------
Title:  Senior Account Manager                 Title:  Senior Account Manager

                                       33
<PAGE>   37
                                                                       Exhibit A


                                      FORM

                                       of

                   CERTIFICATE OF DETERMINATION OF PREFERENCES

                                       of

                  SERIES A JUNIOR PARTICIPATING PREFERRED STOCK

                                       of

                              NELLCOR INCORPORATED

                         (Pursuant to Section 151 of the
                        Delaware General Corporation Law)

         Nellcor Incorporated, a corporation organized and existing under the
General Corporation Law of the State of Delaware (hereinafter called the
"corporation"), hereby certifies that the following resolution was adopted by
the Board of Directors of the corporation as required by Section 151 of the
General Corporation Law at a meeting duly called and held on June 11, 1991:

         RESOLVED, that pursuant to the authority granted to and vested in the
Board of Directors of the corporation in accordance with the provisions of its
Certificate of Incorporation, the Board of Directors hereby creates a series of
Preferred Stock, par value $.001 per share, of the corporation and hereby states
the designation and number of shares, and fixes the relative rights, preferences
and limitations thereof (in addition to the provisions set forth in the
Certificate of Incorporation of the corporation, which are applicable to the
Preferred Stock of all classes and series), as follows:

         Series A Junior Participating Preferred Stock:

         Section 1. Designation and Amount. Five Hundred Thousand (500,000)
shares of Preferred Stock, $.001 par value, are designated "Series A Junior
Participating Preferred Stock" with the rights, preferences, privileges and
restrictions specified herein (the "Series A Preferred Stock"). Such number of
shares may be increased or decreased by resolution of the Board of Directors;
provided, that no decrease shall reduce the number of shares of Series A
Preferred Stock to a number less than the number of shares then outstanding plus
the number of shares reserved for issuance upon the exercise of outstanding
options, rights or warrants or upon the conversion of any outstanding securities
issued by the corporation convertible into Series A Preferred Stock.

                                      A-1
<PAGE>   38
         Section 2. Dividends and Distributions.

         (a) Subject to the rights of the holders of any shares of any series of
Preferred Stock (or any similar stock) ranking prior and superior to the Series
A Preferred Stock with respect to dividends, the holders of shares of Series A
Preferred Stock, in preference to the holders of Common Stock, par value $.001
per share (the "Common Stock"), of the corporation, and of any other junior
stock, shall be entitled to receive, when, as and if declared by the Board of
Directors out of funds legally available for the purpose, quarterly dividends
payable in cash on the first day of March, June, September and December in each
year (each such date being referred to herein as a "Quarterly Dividend Payment
Date"), commencing on the first Quarterly Dividend Payment Date after the first
issuance of a share or fraction of a share of Series A Preferred Stock, in an
amount per share (rounded to the nearest cent) equal to the greater of (a) $1 or
(b) subject to the provision for adjustment hereinafter set forth, 100 times the
aggregate per share amount of all cash dividends, and 100 times the aggregate
per share amount (payable in kind) of all non-cash dividends or other
distributions, other than a dividend payable in shares of Common Stock or a
subdivision of the outstanding shares of Common Stock (by reclassification or
otherwise) declared on the Common Stock since the immediately preceding
Quarterly Dividend Payment Date or, with respect to the first Quarterly Dividend
Payment Date, since the first issuance of any share or fraction of a share of
Series A Preferred Stock. In the event the corporation shall at any time declare
or pay any dividend on the Common Stock payable in shares of Common Stock, or
effect a subdivision or combination or consolidation of the outstanding shares
of Common Stock (by reclassification or otherwise than by payment of a dividend
in shares of Common Stock) into a greater or lesser number of shares of Common
Stock, then in each such case the amount to which holders of shares of Series A
Preferred Stock were entitled immediately prior to such event under clause (b)
of the preceding sentence shall be adjusted by multiplying such amount by a
fraction, the numerator of which is the number of shares of Common Stock
outstanding immediately after such event and the denominator of which is the
number of shares of Common Stock that were outstanding immediately prior to such
event.

         (b) The corporation shall declare a dividend or distribution on the
Series A Preferred Stock as provided in paragraph (A) of this Section
immediately after it declares a dividend or distribution on the Common Stock
(other than a dividend payable in shares of Common Stock); provided that, in the
event no dividend or distribution shall have been declared on the Common Stock
during the period between any Quarterly Dividend Payment Date and the next
subsequent Quarterly Dividend Payment Date, a dividend of $1 per share on the
Series A Preferred Stock shall nevertheless be payable on such subsequent
Quarterly Dividend Payment Date.

         (c) Dividends shall begin to accrue and be cumulative on outstanding
shares of Series A Preferred Stock from the Quarterly Dividend Payment Date next
preceding the date of issue of such shares, unless the date of issue of such
shares is prior to the record date for the first Quarterly Dividend Payment
Date, in which case dividends on such shares shall begin to accrue from the date
of issue of such shares, or unless the date of issue is a Quarterly Dividend
Payment Date or is a date after the record date for the determination of holders
of shares of Series A Preferred Stock entitled to receive a quarterly dividend
and before such Quarterly Dividend Payment Date, in either of which events such
dividends shall begin to accrue and be cumulative 

                                      A-2
<PAGE>   39
from such Quarterly Dividend Payment Date. Accrued but unpaid dividends shall
not bear interest. Dividends paid on the shares of Series A Preferred Stock in
an amount less than the total amount of such dividends at the time accrued and
payable on such shares shall be allocated pro rata on a share-by-share basis
among all such shares at the time outstanding. The Board of Directors may fix a
record date for the determination of holders of shares of Series A Preferred
Stock entitled to receive payment of a dividend or distribution declared
thereon, which record date shall be not more than 60 days prior to the date
fixed for the payment thereof.

         Section 3. Voting Rights. The holders of shares of Series A Preferred
Stock shall have the following voting rights:

         (a) Subject to the provision for adjustment hereinafter set forth, each
share of Series A Preferred Stock shall entitle the holder thereof to 100 votes
on all matters submitted to a vote of the stockholders of the corporation. In
the event the corporation shall at any time declare or pay any dividend on the
Common Stock payable in shares of Common Stock, or effect a subdivision or
combination or consolidation of the outstanding shares of Common Stock (by
reclassification or otherwise than by payment of a dividend in shares of Common
Stock) into a greater or lesser number of shares of Common Stock, then in each
such case the number of votes per share to which holders of shares of Series A
Preferred Stock were entitled immediately prior to such event shall be adjusted
by multiplying such number by a fraction, the numerator of which is the number
of shares of Common Stock outstanding immediately after such event and the
denominator of which is the number of shares of Common Stock that were
outstanding immediately prior to such event.

         (b) Except as otherwise provided herein, in any other Certificate of
Determination of Preferences creating a series of Preferred Stock or any similar
stock, or by law, the holders of shares of Series A Preferred Stock and the
holders of shares of Common Stock and any other capital stock of the corporation
having general voting rights shall vote together as one class on all matters
submitted to a vote of stockholders of the corporation.

         (c) Except as set forth herein, or as otherwise provided by law,
holders of Series A Preferred Stock shall have no special voting rights and
their consent shall not be required (except to the extent they are entitled to
vote with holders of Common Stock as set forth herein) for taking any corporate
action.

         Section 4.  Certain Restrictions.

         (a) Whenever quarterly dividends or other dividends or distributions
payable on the Series A Preferred Stock as provided in Section 2 are in arrears,
thereafter and until all accrued and unpaid dividends and distributions, whether
or not declared, on shares of Series A Preferred Stock outstanding shall have
been paid in full, the corporation shall not:

                  (i) declare or pay dividends, or make any other distributions,
         on any shares of stock ranking junior (either as to dividends or upon
         liquidation, dissolution or winding up) to the Series A Preferred
         Stock;

                                      A-3
<PAGE>   40
                  (ii)  declare or pay dividends, or make any other
         distributions, on any shares of stock ranking on a parity (either as to
         dividends or upon liquidation, dissolution or winding up) with the
         Series A Preferred Stock, except dividends paid ratably on the Series A
         Preferred Stock and all such parity stock on which dividends are
         payable or in arrears in proportion to the total amounts to which the
         holders of all such shares are then entitled;

                  (iii) redeem or purchase or otherwise acquire for
         consideration shares of any stock ranking junior (either as to
         dividends or upon liquidation, dissolution or winding up) to the Series
         A Preferred Stock, provided that the corporation may at any time
         redeem, purchase or otherwise acquire shares of any such junior stock
         in exchange for shares of any stock of the corporation ranking junior
         (either as to dividends or upon dissolution, liquidation or winding up)
         to the Series A Preferred Stock; or

                  (iv)  redeem or purchase or otherwise acquire for
         consideration any shares of Series A Preferred Stock, or any shares of
         stock ranking on a parity with the Series A Preferred Stock except in
         accordance with a purchase offer made in writing or by publication (as
         determined by the Board of Directors) to all holders of such shares
         upon such terms as the Board of Directors, after consideration of the
         respective annual dividend rates and other relative rights and
         preferences of the respective series and classes, shall determine in
         good faith will result in fair and equitable treatment among the
         respective series or classes.

         (b) The corporation shall not permit any subsidiary of the corporation
to purchase or otherwise acquire for consideration any shares of stock of the
corporation unless the corporation could, under paragraph (A) of this Section 4,
purchase or otherwise acquire such shares at such time and in such manner.

         Section 5. Reacquired Shares. Any shares of Series A Preferred Stock
purchased or otherwise acquired by the corporation in any manner whatsoever
shall be retired and cancelled promptly after the acquisition thereof. All such
shares shall upon their cancellation become authorized but unissued shares of
Preferred Stock and may be reissued as part of a new series of Preferred Stock
subject to the conditions and restrictions on issuance set forth herein, in the
Restated Certificate of Incorporation, or in any other Certificate of
Determination of Preferences creating a series of Preferred Stock or any similar
stock or as otherwise required, by law.

         Section 6. Liquidation, Dissolution or Winding Up. Upon any
liquidation, dissolution or winding up of the corporation, no distribution shall
be made (1) to the holders of shares of stock ranking junior (either as to
dividends or upon liquidation, dissolution or winding up) to the Series A
Preferred Stock unless, prior thereto, the holders of shares of Series A
Preferred Stock shall have received $100 per share, plus an amount equal to
accrued and unpaid dividends and distributions thereon, whether or not declared,
to the date of such payment, provided that the holders of shares of Series A
Preferred Stock shall be entitled to receive an aggregate amount per share,
subject to the provision for adjustment hereinafter set forth, equal to 100
times the aggregate amount to be distributed per share to holders of shares of
Common Stock, or (2) to the 

                                      A-4
<PAGE>   41
holders of shares of stock ranking on a parity (either as to dividends or upon
liquidation, dissolution or winding up) with the Series A Preferred Stock,
except distributions made ratably on the Series A Preferred Stock and all such
parity stock in proportion to the total amounts to which the holders of all such
shares are entitled upon such liquidation, dissolution or winding up. In the
event the corporation shall at any time declare or pay any dividend on the
Common Stock payable in shares of Common Stock, or effect a subdivision or
combination or consolidation of the outstanding shares of Common Stock (by
reclassification or otherwise than by payment of a dividend in shares of Common
Stock) into a greater or lesser number of shares of Common Stock, then in each
such case the aggregate amount to which holders of shares of Series A Preferred
Stock were entitled immediately prior to such event under the proviso in clause
(1) of the preceding sentence shall be adjusted by multiplying such amount by a
fraction the numerator of which is the number of shares of Common Stock
outstanding immediately after such event and the denominator of which is the
number of shares of Common Stock that were outstanding immediately prior to such
event.

         Section 7.  Consolidation, Merger, etc. In case the corporation shall
enter into any consolidation, merger, combination or other transaction in which
the shares of Common Stock are exchanged for or changed into other stock or
securities, cash and/or any other property, then in any such case each share of
Series A Preferred Stock shall at the same time be similarly exchanged or
changed into an amount per share, subject to the provision for adjustment
hereinafter set forth, equal to 100 times the aggregate amount of stock,
securities, cash and/or any other property (payable in kind), as the case may
be, into which or for which each share of Common Stock is changed or exchanged.
In the event the corporation shall at any time declare or pay any dividend on
the Common Stock payable in shares of Common Stock, or effect a subdivision or
combination or consolidation of the outstanding shares of Common Stock (by
reclassification or otherwise than by payment of a dividend in shares of Common
Stock) into a greater or lesser number of shares of Common Stock, then in each
such case the amount set forth in the preceding sentence with respect to the
exchange or change of shares of Series A Preferred Stock shall be adjusted by
multiplying such amount by a fraction, the numerator of which is the number of
shares of Common Stock outstanding immediately after such event and the
denominator of which is the number of shares of Common Stock that were
outstanding immediately prior to such event.

         Section 8.  No Redemption. The shares of Series A Preferred Stock shall
not be redeemable.

         Section 9.  Rank. The Series A Preferred Stock shall rank, with respect
to the payment of dividends and the distribution of assets, junior to all series
of any other class of the corporation's Preferred Stock.

         Section 10. Amendment. The Certificate of Incorporation of the
corporation shall not be amended in any manner which would materially alter or
change the powers, preferences or special rights of the Series A Preferred Stock
so as to affect them adversely without the affirmative vote of the holders of at
least two-thirds of the outstanding shares of Series A Preferred Stock, voting
together as a single class.

                                      A-5
<PAGE>   42
         IN WITNESS WHEREOF the undersigned have executed this certificate on
June 11, 1991.


                                                   -----------------------------
                                                   C. Raymond Larkin, Jr.
                                                   President and Chief Executive
                                                   Officer


                                                   -----------------------------
                                                   Linda L. Carloni
                                                   Secretary

                                      A-6
<PAGE>   43
                                                                       Exhibit B

                            FORM OF RIGHT CERTIFICATE

Certificate No. R-                                                   ____ Rights

             NOT EXERCISABLE AFTER MARCH 8, 2006 OR EARLIER IF REDEMPTION OR
             EXCHANGE OCCURS. THE RIGHTS ARE SUBJECT TO REDEMPTION AT $.001 PER
             RIGHT AND TO EXCHANGE ON THE TERMS SET FORTH IN THE RIGHTS
             AGREEMENT.

                                Right Certificate

                      NELLCOR PURITAN BENNETT INCORPORATED

         This certifies that _______________ or registered assigns, is the
registered owner of the number of Rights set forth above, each of which entitles
the owner thereof, subject to the terms, provisions and conditions of the Rights
Agreement, dated as of June 11, 1991, as amended on September 1, 1992, and as
amended and restated on March 8, 1996, and as such agreement may be further
amended from time to time (the "Rights Agreement"), between Nellcor Puritan
Bennett Incorporated, a Delaware corporation (the "Company), and The First
National Bank of Boston (the "Rights Agent"), to purchase from the Company at
any time after the Distribution Date (as such term is defined in the Rights
Agreement) and prior to 5:00 P.M., Boston time, on March 8, 2006 at the office
of the Rights Agent designated for such purpose, or at the office of its
successor as Rights Agent, one one-hundredth of a fully paid non-assessable
share of Series A Junior Participating Preferred Stock, par value $.001 per
share (the "Preferred Shares"), of the Company, at a purchase price of $320 per
one one-hundredth of a Preferred Share (the "Purchase Price"), upon presentation
and surrender of this Right Certificate with the Form of Election to Purchase
duly executed.

         As provided in the Rights Agreement, the Purchase Price and the number
of one one-hundredths of a Preferred Share which may be purchased upon the
exercise of the Rights evidenced by this Right Certificate are subject to
modification and adjustment upon the happening of certain events.

         This Right Certificate is subject to all of the terms, provisions and
conditions of the Rights Agreement, as amended from time to time, which terms,
provisions and conditions are hereby incorporated herein by reference and made a
part hereof and to which Rights Agreement reference is hereby made for a full
description of the rights, limitations of rights, obligations, duties and
immunities hereunder of the Rights Agent, the Company and the holders of the
Right Certificates. Copies of the Rights Agreement are on file at the principal
executive offices of the Company and the above-mentioned offices of the Rights
Agent.

                                      B-1
<PAGE>   44
         This Right Certificate, with or without other Right Certificates, upon
surrender at the office of the Rights Agent designated for such purpose, may be
exchanged for another Right Certificate or Right Certificates of like tenor and
date evidencing Rights entitling the holder to purchase a like aggregate number
of Preferred Shares as the Rights evidenced by the Right Certificate or Right
Certificates surrendered shall have entitled such holder to purchase. If this
Right Certificate shall be exercised in part, the holder shall be entitled to
receive upon surrender hereof another Right Certificate or Right Certificates
for the number of whole Rights not exercised.

         Subject to the provisions of the Rights Agreement, the Rights evidenced
by this Right Certificate (i) may be redeemed by the Company at a redemption
price of $.001 per Right or (ii) may be exchanged in whole or in part for shares
of the Company's Common Stock or Preferred Shares, par value $.001 per share.

         No fractional Preferred Shares will be issued upon the exercise of any
Right or Rights evidenced hereby (other than fractions which are integral
multiples of one one-hundredth of a Preferred Share, which may, at the election
of the Company, be evidenced by depositary receipts), but in lieu thereof a cash
payment will be made, as provided in the Rights Agreement.

         No holder of this Right Certificate, as such, shall be entitled to vote
or receive dividends or be deemed for any purpose the holder of the Preferred
Shares or of any other securities of the Company which may at any time be
issuable on the exercise hereof, nor shall anything contained in the Rights
Agreement or herein be construed to confer upon the holder hereof, as such, any
of the rights of a stockholder of the Company or any right to vote for the
election of directors or upon any matter submitted to stockholders at any
meeting thereof, or to give or withhold consent to any corporate action, or to
receive notice of meetings or other actions affecting stockholders (except as
provided in the Rights Agreement), or to receive dividends or subscription
rights, or otherwise, until the Right or Rights evidenced by this Right
Certificate shall have been exercised as provided in the Rights Agreement.

                                      B-2
<PAGE>   45
         This Right Certificate shall not be valid or obligatory for any purpose
until it shall have been countersigned by the Rights Agent.

         WITNESS the facsimile signature of the proper officers of the Company
and its corporate seal. Dated as of _________________.

ATTEST:                                    NELLCOR PURITAN BENNETT

                                           INCORPORATED

__________________________________         By___________________________________

Countersigned:

THE FIRST NATIONAL BANK OF BOSTON

as Rights Agent

By________________________________
       Authorized Signature

                                      B-3
<PAGE>   46
                    Form of Reverse Side of Right Certificate


                               FORM OF ASSIGNMENT

                (To be executed by the registered holder if such
               holder desires to transfer the Right Certificate.)

         FOR VALUE RECEIVED ________________________ hereby sells, assigns and
transfers unto

            _____________________________________________

            _____________________________________________

            _____________________________________________
            (Please print name and address of transferee)

this Right Certificate, together with all right, title and interest therein, and
does hereby irrevocably constitute and appoint __________________ Attorney, to
transfer the within Right Certificate on the books of the within-named Company,
with full power of substitution.

Dated:______________________________

                                                  ______________________________
                                                  Signature


Signature Guaranteed:

         Signatures must be guaranteed by a member firm of a registered national
securities exchange, a member of the National Association of Securities Dealers,
Inc., or a commercial bank or trust company having an office or correspondent in
the United States.

                               __________________

         The undersigned hereby certifies that the Rights evidenced by this
Right Certificate are not beneficially owned by an Acquiring Person or an
Affiliate or Associate thereof (as defined in the Rights Agreement).


                                                  ______________________________
                                                  Signature

                                      B-4
<PAGE>   47
              Form of Reverse Side of Right Certificate (continued)

                          FORM OF ELECTION TO PURCHASE

                  (To be executed if holder desires to exercise
                  Rights represented by the Right Certificate.)

To NELLCOR PURITAN BENNETT INCORPORATED

         The undersigned hereby irrevocably elects to exercise _________________
Rights represented by this Right Certificate to purchase the Preferred Shares
issuable upon the exercise of such Rights and requests that certificates for
such Preferred Shares be issued in the name of:

Please insert social security
or other identifying number:  __________

            ____________________________________________

            ____________________________________________

            ____________________________________________
            (Please print name and address of transferee)

         If such number of Rights shall not be all the Rights evidenced by this
Right Certificate, a new Right Certificate for the balance remaining of such
Rights shall be registered in the name of and delivered to:

Please insert social security
or other identifying number:  __________

            ____________________________________________

            ____________________________________________

            ____________________________________________
            (Please print name and address of transferee)


Dated:_______________________

                                                         _______________________
                                                         Signature


Signature Guaranteed:

                                      B-5

<PAGE>   48
         Signatures must be guaranteed by a member firm of a registered national
securities exchange, a member of the National Association of Securities Dealers,
Inc., or a commercial bank or trust company having an office or correspondent in
the United States.

                              ____________________

         The undersigned hereby certifies that the Rights evidenced by this
Right Certificate are not beneficially owned by an Acquiring Person or an
Affiliate or Associate thereof (as defined in the Rights Agreement).

                                                         _______________________
                                                         Signature

                              ____________________



                                     NOTICE

         The signature in the Form of Assignment or Form of Election to
Purchase, as the case may be, must conform to the name as written upon the face
of this Right Certificate in every particular, without alteration or enlargement
or any change whatsoever.

         In the event the certification set forth above in the Form of
Assignment or the Form of Election to Purchase, as the case may be, is not
completed, the Company and the Rights Agent will deem the beneficial owner of
the Rights evidenced by this Right Certificate to be an Acquiring Person or an
Affiliate or Associate thereof (as defined in the Rights Agreement) and such
Assignment or Election to Purchase will not be honored.

                                      B-6
<PAGE>   49
                                                                       Exhibit C

                          SUMMARY OF RIGHTS TO PURCHASE
                                PREFERRED SHARES

         On June 11 1991, the Board of Directors of Nellcor Incorporated (the
"Company") declared a dividend of one preferred share purchase right (a "Right")
for each outstanding share of common stock, par value $.001 per share (the
"Common Shares"), of the Company. The dividend is payable on June 26, 1991 (the
"Record Date") to the stockholders of record on that date. Each Right entitles
the registered holder to purchase from the Company one one-hundredth of a share
of Series A Junior Participating Preferred Stock, par value $.001 per share (the
"Preferred Shares"), of the Company at a price of $90.00 per one one-hundredth
of a Preferred Share (the "Purchase Price"), subject to adjustment. The
description and terms of the Rights are set forth in a Rights Agreement dated as
of September 1, 1992 (the "Rights Agreement"), between the Company and The First
National Bank of Boston, as Rights Agent (the "Rights Agent").

         Initially, the Rights will be evidenced by the stock certificates
representing Common Shares then outstanding, and no separate Right Certificates,
as defined, will be distributed. Until the earlier to occur of (i) 10 days
following a public announcement that a person or group of affiliated or
associated persons (an "Acquiring Person") have acquired beneficial ownership of
15% or more of the outstanding Common Shares or (ii) 10 business days (or such
later date as may be determined by action of the Board of Directors prior to
such time as any person or group of affiliated persons becomes an Acquiring
Person) following the commencement of, or announcement of an intention to make,
a tender offer or exchange offer the consummation of which would result in the
beneficial ownership by a person or group of 15% or more of the outstanding
Common Shares (the earlier of such dates being called the "Distribution Date"),
the Rights will be evidenced, with respect to any of the Common Share
certificates outstanding as of the Record Date, by such Common Share certificate
to which a copy of this Summary of Rights may be attached.

         The Rights Agreement provides that, until the Distribution Date (or
earlier redemption or expiration of the Rights), the Rights will be transferred
with and only with the Common Shares. Until the Distribution Date (or earlier
redemption or expiration of the Rights), new Common Share certificates issued
after the Record Date upon transfer or new issuance of Common Shares will
contain a notation incorporating the Rights Agreement by reference. Until the
Distribution Date (or earlier redemption or expiration of the Rights) the
surrender for transfer of any certificates for Common Shares outstanding as of
the Record Date, even without such notation or a copy of this Summary of Rights
being attached thereto, will also constitute the transfer of the Rights
associated with the Common Shares represented by such certificate. As soon as
practicable following the Distribution Date, separate certificates evidencing
the Rights ("Right Certificates") will be mailed to holders of record of the
Common Shares as of the close of 

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<PAGE>   50
business on the Distribution Date and such separate Right Certificates alone
will evidence the Rights.

         The Rights are not exercisable until the Distribution Date. The Rights
will expire on June 26, 2001 (the "Final Expiration Date"), unless the Final
Expiration Date is extended or unless the Rights are earlier redeemed or
exchanged by the Company, in each case, as described below.

         The Purchase Price payable, and the number of Preferred Shares or other
securities or property issuable, upon exercise of the Rights are subject to
adjustment from time to time to prevent dilution (i) in the event of a stock
dividend on, or a subdivision, combination or reclassification of, the Preferred
Shares, (ii) upon the grant to holders of the Preferred Shares of certain rights
or warrants to subscribe for or purchase Preferred Shares at a price, or
securities convertible into Preferred Shares with a conversion price, less than
the then-current market price of the Preferred Shares or (iii) upon the
distribution to holders of the Preferred Shares of evidences of indebtedness or
assets (excluding regular periodic cash dividends paid out of earnings or
retained earnings or dividends payable in Preferred Shares) or of subscription
rights or warrants (other than those referred to above).

         The number of outstanding Rights and the number of one one-hundredths
of a Preferred Share issuable upon exercise of each Right are also subject to
adjustment in the event of a stock split of the Common Shares or a stock
dividend on the Common Shares payable in Common Shares or subdivisions,
consolidations or combinations of the Common Shares occurring, in any such case,
prior to the Distribution Date.

         Preferred Shares purchasable upon exercise of the Rights will not be
redeemable. Each Preferred Share will be entitled to a minimum preferential
quarterly dividend payment of $1 per share but will be entitled to an aggregate
dividend of 100 times the dividend declared per Common Share. In the event of
liquidation, the holders of the Preferred Shares will be entitled to a minimum
preferential liquidation payment of $100 per share but will be entitled to an
aggregate payment of 100 times the payment made per Common Share. Each Preferred
Share will have 100 votes, voting together with the Common Shares. Finally, in
the event of any merger, consolidation or other transaction in which Common
Shares are exchanged, each Preferred Share will be entitled to receive 100 times
the amount received per Common Share. These rights are protected by customary
anti-dilution provisions. Because of the nature of the Preferred Shares'
dividend, liquidation and voting rights, the value of the one one-hundredth
interest in a Preferred Share purchasable upon exercise of each Right should
approximate the value of one Common Share. The Preferred Shares rank junior to
all other series of the Company's preferred stock.

         In the event that the Company is acquired in a merger or other business
combination transaction or 50% or more of its consolidated assets or earning
power are sold, proper provision will be made so that each holder of a Right
will thereafter have the right to receive, upon the exercise thereof at the then
current exercise price of the Right, that number of shares of common stock of
the acquiring company which at the time of such transaction will have a market
value of two times the exercise price of the Right. In the event that any person
or group of affiliated or 

                                      C-2
<PAGE>   51
associated persons becomes an Acquiring Person, proper provision shall be made
so that each holder of a Right, other than Rights beneficially owned by the
Acquiring Person (which will thereafter be void), will thereafter have the right
to receive upon exercise that number of Common Shares having a market value of
two times the exercise price of the Right (or, if such number of Common Shares
is not authorized, the Company may issue cash, debt, stock or a combination
thereof in exchange for the Rights).

         At any time after any Person becomes an Acquiring Person and prior to
the acquisition by such person or group of 50% or more of the outstanding Common
Shares, the Board of Directors of the Company may exchange the Rights (other
than Rights owned by such person or group which will have become void), in whole
or in part, at an exchange ratio of one Common Share, or one one-hundredth of a
Preferred Share (or of a share of a class or series of the Company's preferred
stock having equivalent rights, preferences and privileges or the Company may
issue cash, debt or other property or any combination thereof), per Right
(subject to adjustment).

         With certain exceptions, no adjustment in the Purchase Price will be
required until cumulative adjustments require an adjustment of at least 1% in
such Purchase Price. No fractional Preferred Shares will be issued (other than
fractions which are integral multiples of one one-hundredth of a Preferred
Share, which may, at the election of the Company, be evidenced by depositary
receipts) and in lieu thereof, an adjustment in cash will be made based on the
market price of the Preferred Shares on the last trading day prior to the date
of exercise.

         At any time prior to the earliest of (i) the close of business on the
twentieth day following the first public announcement that a person has become
an Acquiring Person (subject to extension for one or more successive 10 day
periods pursuant to the Rights Agreement), (ii) such time on or after the first
public announcement that a person has become an Acquiring Person as there shall
have occurred a Change of Control (as defined in the Rights Agreement) of the
Company, or (iii) the final Expiration Date, the Board of Directors of the
Company may redeem the Rights in whole, but not in part, at a price of $.001 per
Right (the "Redemption Price"). The redemption of the Rights may be made
effective at such time on such basis with such conditions as the Board of
Directors in its sole discretion may establish. Immediately upon any redemption
of the Rights, the right to exercise the Rights will terminate and the only
right of the holders of Rights will be to receive the Redemption Price.

         The terms of the Rights may be amended by the Board of Directors of the
company without the consent of the holders of the Rights, including an amendment
to lower certain thresholds described above to any percentage which is (i)
greater than the largest percentage of the outstanding Common Shares then known
to the Company to be beneficially owned by any person or group of affiliated or
associated persons (other than the Company, any Subsidiary of the Company,
employee benefit plans of the Company or any Subsidiary, or any entity holding
Common Shares pursuant to the terms of any such plan) and (ii) not less than
10%, except that from and after such time as any person or group of affiliated
or associated persons becomes an Acquiring Person no such amendment may
adversely affect the interests of the holders of the Rights.

                                      C-3
<PAGE>   52
         Until a Right is exercised, the holder thereof, as such, will have no
rights as a stockholder of the Company, including, without limitation, the right
to vote or to receive dividends.

         A copy of the Rights Agreement has been filed with the Securities and
Exchange Commission as an Exhibit to a Current Report on Form 8-K dated June 11,
1991. A copy of the Rights Agreement is available free of charge from the
Company by writing to: General Counsel and Corporate Secretary, Nellcor
Incorporated, 25495 Whitesell Street, Hayward, California 94545. This summary
description of the Rights does not purport to be complete and is qualified in
its entirety by reference to the Rights Agreement, which is hereby incorporated
herein by reference.

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