NELLCOR PURITAN BENNETT INC
8-K, 1997-08-07
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                    FORM 8-K


                                 CURRENT REPORT
                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                          Date of Report: July 23, 1997


                      NELLCOR PURITAN BENNETT INCORPORATED
                      ------------------------------------
             (Exact Name of Registrant as Specified in its Charter)


                                    Delaware
                                    --------
                         (State or Other Jurisdiction of
                          Incorporation or Organization)

       0-14980                                                94-2789249
       -------                                                ----------
(Commission File Number)                                   (I.R.S. Employer
                                                          Identification No.)


                               4280 Hacienda Drive
                          Pleasanton, California 94588
                          ----------------------------
               (Address of Principal Executive Offices) (Zip Code)


                                 (510) 463-4000
                                 --------------
                         (Registrant's telephone number,
                              including area code)


<PAGE>   2


ITEM 5.  OTHER EVENTS.

         (a) On July 23, 1997, the Registrant entered into an Agreement and Plan
of Merger (the "Agreement") with Mallinckrodt Inc., a New York corporation
("Mallinckrodt"), and NPB Acquisition Corp., a Delaware corporation ("Merger
Sub"). Pursuant to the Agreement, Mallinckrodt would acquire Registrant through
a merger of Merger Sub into the Registrant. Pursuant to the Agreement, (1)
Merger Sub will commence a tender offer (the "Offer") for all of the outstanding
shares of the common stock, par value $.001 ("Common Stock") of Registrant,
together with the associated rights ("Rights") to purchase Series A Junior
Participating Preferred Stock of Registrant at a price of $28.50 per share in
cash (net to the seller) and (2) Merger Sub will merge with and into Registrant
(the "Merger"), in connection with which each share of Common Stock (and the
associated Rights) will be converted into the right to receive $28.50 per share,
in cash. Consummation of the Offer and Merger is subject to the satisfaction or
waiver of certain conditions, including, among others, the expiration or
termination of any applicable waiting period under the Hart-Scott-Rodino
Antitrust Improvements Act of 1976, as amended, the receipt of other required
regulatory approvals, and the absence of certain material adverse changes.
Consummation of the Offer is also subject to the valid tender of a majority of
the total shares outstanding (including shares held by Mallinckrodt and Merger
Sub) on a fully diluted basis. The closing of the Merger is expected to occur as
soon as possible after the satisfaction of the conditions set forth in the
Agreement. The description of the Agreement contained herein is qualified in its
entirety by reference to the Agreement, which is Exhibit 2.1 hereto and
incorporated herein by reference.

         (b) As of July 23, 1997, Registrant and The First National Bank of
Boston (the "Rights Agent"), executed an amendment (the "Amendment") to Amended
and Restated Rights Agreement (the "Rights Agreement"). The Amendment relates to
changes in the Rights Agreement required as a result of the Agreement and the
transactions contemplated thereby. The description of the Amendment contained
herein is qualified in its entirety by reference to the Amendment, which is as
Exhibit 4.1 hereto and incorporated herein by reference.

ITEM 7.  FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS

         (a)      Not required.

         (b)      Not required.

         (c)      Exhibits.

<TABLE>
<CAPTION>
Exhibit No.                                          Description
- -----------                                          -----------

<C>              <S>                                                            
2.1              Agreement and Plan of Merger, dated as of July 23, 1996, by and
                 among Nellcor Puritan Bennett Incorporated, a Delaware
                 corporation, Mallinckrodt Inc., a New York corporation, and NPB
                 Acquisition Corp., a Delaware corporation. 
</TABLE>

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<PAGE>   3

<TABLE>
<C>              <S>                                                            
                 (Incorporated by reference to Exhibit 1 of Registrant's
                 Schedule 14D-9, filed July 29, 1997.)

4.1              Amendment to Amended and Restated Rights Agreement, dated as of
                 July 23, 1997, between Nellcor Puritan Bennett Incorporated, a
                 Delaware corporation, and The First National Bank of Boston, a
                 national banking association.
</TABLE>

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                         NELLCOR PURITAN BENNETT INCORPORATED

Date:  August 5, 1997                    /s/ Laureen DeBuono
                                         -------------------
                                         Name:  Laureen DeBuono
                                         Title: Executive Vice President, Human
                                                Resources, Secretary and General
                                                Counsel


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<PAGE>   4

                                  EXHIBIT INDEX
                                  -------------

<TABLE>
<CAPTION>
Exhibit No.                                          Description
- -----------                                          -----------

<C>              <S>                                                            
2.1              Agreement and Plan of Merger, dated as of July 23, 1996, by and
                 among Nellcor Puritan Bennett Incorporated, a Delaware
                 corporation, Mallinckrodt Inc., a New York corporation, and NPB
                 Acquisition Corp., a Delaware corporation. (Incorporated by
                 reference to Exhibit 1 of Registrant's Schedule 14D-9, filed
                 July 29, 1997.)

4.1              Amendment to Amended and Restated Rights Agreement, dated as of
                 July 23, 1997, between Nellcor Puritan Bennett Incorporated, a
                 Delaware corporation, and The First National Bank of Boston, a
                 national banking association.
</TABLE>


                                       4

<PAGE>   1

                                                                     EXHIBIT 4.1


               AMENDMENT TO AMENDED AND RESTATED RIGHTS AGREEMENT

         This Amendment, dated as of July 23, 1997, to the Rights Agreement,
dated originally as of September 1, 1992 and as amended and restated as of March
8, 1996 (this "Agreement") between Nellcor Puritan Bennett Incorporated, a
Delaware corporation (the "Company"), and The First National Bank of Boston, a
national banking association (the "Rights Agent"). Unless otherwise defined
herein, capitalized terms used herein shall have the same meaning as those set
forth in Agreement.

         WHEREAS, the Company, on the one hand, and Mallinckrodt Inc., a New
York corporation ("Purchaser") and NPB Acquisition Corporation, a Delaware
corporation and wholly-owed subsidiary of Purchaser ("Merger Sub"), on the other
hand, are concurrently herewith entering into an Agreement and Plan of Merger,
dated as of July 23, 1997 ("Merger Agreement"), whereby Purchaser would acquire
the Company pursuant to a two-step transaction consisting of (i) a tender offer
("Offer") to purchase all of the outstanding Common Shares of the Company at a
price of $28.50 per common Share in cash net to the seller, subject to the terms
and conditions set forth in Annex A to the Merger Agreement (the "Offer
Conditions), followed by (ii) a Merger of Merger Sub into the Company (the
"Merger"); and

         WHEREAS, the Merger Agreement requires that, upon acceptance of, and
payment for, by Purchaser, of such number of Common Shares satisfying the
Minimum Condition pursuant to the Offer, all outstanding Rights under the
Agreement will expire, and neither the Company, Merger Sub nor Purchaser shall
have any obligations under the Agreement to any holder (or former holder) of
Rights following such consummation of the Offer; and

         WHEREAS, the Board of Directors of the Company, consisting solely of
Incumbent Directors, having unanimously approved the Merger Agreement and the
Merger and the Offer;

         NOW, THEREFOR, in consideration of the premises, the parties hereby
agree as follows:

         1.       Section 7(a) of the Agreement is hereby amended to read in its
                  entirety as follows:

                           "(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 until the Expiration 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-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 



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<PAGE>   2

                  Date") and (iii) the time at which such Rights are exchanged
                  as provided in Section 24 hereof. In addition, all outstanding
                  Rights under this Agreement (whether or not tendered and
                  purchased pursuant to the Offer (as defined below) shall
                  expire upon and as of the acceptance (so long as Mallinckrodt
                  Inc., a New York corporation or a wholly-owned subsidiary
                  thereof ("Purchaser") thereafter purchases Common Shares
                  pursuant to the Offer) for payment pursuant to the Offer of
                  Common Shares which, together with any Common Shares owned by
                  Purchaser or NPB Acquisition Corp., constitutes more than 50%
                  of the voting power (determined on a fully-diluted basis) of
                  all the securities of the Company entitled to vote generally
                  in the election of directors or in connection with a merger,
                  upon consummation of the Offer (the "Date of Acceptance"). The
                  earliest date to occur referred to in clauses (i), (ii) and
                  (iii) in the first sentence hereof or the Date of Acceptance
                  is herein referred to as the "Expiration Date." For the
                  purpose of the preceding sentence, the term "Offer" shall mean
                  the tender offer provided for by, and consummated in
                  accordance with the terms of, the Agreement and Plan of
                  Merger, dated as of July 23, 1997, as amended from time to
                  time, by and among the Company, Purchaser and Merger Sub."

         2.       The Agreement is hereby amended by adding thereto the
                  following new Section 35:

                  "Section 35. Mallinckrodt Merger Agreement. Notwithstanding
                  any provision of this Agreement to the contrary, none of
                  Purchaser, Merger Sub (as defined in Section 7(a)) or any
                  other wholly owned direct or indirect subsidiary of Purchaser
                  shall be or be deemed to become an Acquiring Person, and no
                  Distribution Date, Shares Acquisition Date or Triggering Event
                  shall occur or be deemed to occur, in either case solely by
                  reason of the execution of the Agreement and Plan of Merger,
                  dated as of July 23, 1997, as the same may be amended from
                  time to time, by and among the Company, Purchaser and Merger
                  Sub, or the announcement, commencement or consummation of the
                  transactions contemplated thereby."



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<PAGE>   3



         IN WITNESS WHEREOF, the undersigned have executed this Agreement to be
duly executed and their seals attested, all as of the day and year first above
written.

                                              NELLCOR PURITAN BENNETT
Attest:                                       INCORPORATED

By:   /s/  Edward Lopez                       By:   /s/ Laureen DeBuono
      -----------------------------                 ----------------------------
Title:                                        Title:
      -----------------------------                 ----------------------------




Attest:                                       THE FIRST NATIONAL BANK OF BOSTON

By:   /s/ Matt Arba                           By:   /s/ Geoffrey D. Anderson
      -----------------------------                 ----------------------------
Title:  Account Manager                       Title:  Director




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