PURITAN BENNETT CORP
SC 14D1/A, 1994-11-23
ORTHOPEDIC, PROSTHETIC & SURGICAL APPLIANCES & SUPPLIES
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<PAGE>
 
                         SECURITIES AND EXCHANGE COMMISSION
                               WASHINGTON, D.C. 20549

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

                                   SCHEDULE 14D-1
                                  (Amendment No. 3)         

                               TENDER OFFER STATEMENT
                                     PURSUANT TO
               SECTION 14(D)(1) OF THE SECURITIES EXCHANGE ACT OF 1934

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

                             PURITAN-BENNETT CORPORATION
                              (Name of Subject Company)

                                PB ACQUISITION CORP.
                             THERMO ELECTRON CORPORATION
                                      (Bidders)

                       COMMON STOCK, $1.00 PAR VALUE PER SHARE
               (Including the Associated Common Stock Purchase Rights)
                           (Title of Class of Securities)

                                     746299 10 6       
                        (CUSIP Number of Class of Securities)

                               SETH H. HOOGASIAN, ESQ.
                             Thermo Electron Corporation
                                   81 Wyman Street
                                    P.O. Box 9046
                                 Waltham, MA  02254
                                   (617) 622-1000

                                      Copy To:
                               DAVID E. REDLICK, ESQ.
                                    Hale and Dorr
                                   60 State Street
                                  Boston, MA 02109
                                   (617) 526-6000

            (Names, Addresses and Telephone Numbers of Persons Authorized
             to Receive Notices and Communications on Behalf of Bidder)

                              ------------------------
<PAGE>
 
                              CALCULATION OF FILING FEE
                                                                               
         =======================================================================

         Transaction Valuation* $315,386,883 Amount of Filing Fee** $63,077.38

         =======================================================================
         --------------------
         *    For purposes of calculating fee only.  This amount is based
              upon (a) 11,914,965 outstanding shares of Common Stock, $1.00
              par value per share (the "Shares"), of the Subject Company
              (excluding Shares owned by the Bidders), as reported in the
              Quarterly Report on Form 10-Q of the Subject Company for the
              quarter ended July 31, 1994, (b) 957,969 shares reserved for
              issuance upon the exercise of options outstanding as reported
              in the Annual Report on Form 10-K of the Subject Company for
              the year ended January 31, 1994 and (c) the price offered per
              Share.

         **   The amount of the filing fee, calculated in accordance with
              Regulation 240.0-11 under the Securities Exchange Act of
              1934, as amended, equals 1/50 of one percent of the
              Transaction Valuation.
              
         / X /     Check box if any part of the fee is offset as provided
                   by Rule 0-11(a)(2) and identify the filing with which
                   the offsetting fee was previously paid.  Identify the
                   previous filing by registration statement number, or the
                   form or schedule and the date of its filing.

                   Amount Previously Paid:            $63,077.38

                   Form or Registration No.:          Schedule 14D-1

                   Filing Party:                      PB Acquisition Corp.
                                                      and Thermo Electron
                                                      Corporation

                   Date Filed:                        October 25, 1994



                                        -2-
<PAGE>
 
              This Amendment No. 3 to Tender Offer Statement on
         Schedule 14D-1 ("Amendment No. 3") relates to the offer by PB
         Acquisition Corp., a Delaware corporation (the "Purchaser") and a
         wholly owned subsidiary of Thermo Electron Corporation, a Delaware
         corporation (the "Parent"), to purchase all of the outstanding
         shares of Common Stock, $1.00 par value per share (the "Shares"),
         of Puritan-Bennett Corporation, a Delaware corporation (the
         "Company"), and (unless, on or before the Expiration Date (as
         defined in the Offer to Purchase), the associated Common Stock
         Purchase Rights (the "Rights") have been redeemed by the Company's
         Board of Directors) the Rights issued pursuant to the Rights Agreement
         dated as of May 2, 1989, between the Company and United Missouri Bank
         of Kansas City, N.A., (now known as UMB Bank, N.A.), as Rights Agent,
         at a purchase price of $24.50 per Share (and associated Right), net to
         the seller in cash, without interest thereon, upon the terms and
         subject to the conditions set forth in the Offer to Purchase dated
         October 25, 1994 (the "Offer to Purchase"), and in the related Letter
         of Transmittal (which, together with the Offer to Purchase, constitute
         the "Offer"), copies of which are attached as Exhibits (a)(1) and
         (a)(2), respectively, to the Statement on Schedule 14D-1 originally
         filed with the Commission on October 25, 1994, as amended on November
         8, 1994 and November 22, 1994 (the "Original Statement").

              The Original Statement is amended as follows:

         ITEM 10.  ADDITIONAL INFORMATION.

              The information set forth in Item 10(f) is hereby amended and 
         supplemented by the following:
           
              The Purchaser has extended the Offer until 12:00 midnight, New
         York City time, on Monday, November 28, 1994. On November 23, 1994, the
         Parent issued a press release announcing such extention of the Offer.
         The full text of the press release is set forth in Exhibit (a)(11) and
         incorporated herein by reference.

         ITEM 11.  MATERIAL TO BE FILED AS EXHIBITS.

              Item 11 is hereby amended by adding immediately following the
         reference to Exhibit (a)(10) the following:

              (a)(11)  Press Release issued by the Parent on November 23, 1994. 












                                        -3-
<PAGE>



                                      SIGNATURE

              After due inquiry and to the best of my knowledge and belief,
         I certify that the information set forth in this Amendment No. 3
         is true, complete and correct.

                                      THERMO ELECTRON CORPORATION
                                   
                                   
                                      By: /s/ John N. Hatsopoulos
                                          -----------------------------------
                                          Name: John N. Hatsopoulos
                                          Title: Chief Financial Officer and
                                                 Executive Vice President
                                   
                                   
                                   
                                      PB ACQUISITION CORP.
                                   
                                   
                                      By: /s/ John W. Wood, Jr.
                                          -----------------------------------
                                          Name: John W. Wood, Jr.
                                          Title: President

         Date: November 23, 1994





                                        -4-
<PAGE>

                                    EXHIBIT INDEX


        <TABLE> 
        <CAPTION> 

         EXHIBIT      DESCRIPTION
         -------      -----------
         <C>          <S>                                               <S> 
         (a)(1)       Offer to Purchase dated October 25, 1994          *

         (a)(2)       Letter of Transmittal                             *

         (a)(3)       Notice of Guaranteed Delivery                     * 

         (a)(4)       Letter from the Dealer Manager to Brokers, 
                      Dealers, Commercial Banks, Trust Companies
                      and Nominees                                      * 

         (a)(5)       Letter to clients for use by Brokers, 
                      Dealers, Commercial Banks, Trust Companies
                      and Nominees                                      * 

         (a)(6)       Guidelines for Certification of Taxpayer
                      Identification Number on Substitute 
                      Form W-9                                          * 

         (a)(7)       Summary Advertisement as published on 
                      October 25, 1994                                  *

         (a)(8)       Press Release issued by the Parent on              
                      October 24, 1994                                  * 

         (a)(9)       Press Release issued by the Parent on              
                      November 8, 1994                                  * 

         (a)(10)      Press Release issued by the Parent on             *  
                      November 22, 1994                                 
   
         (a)(11)      Press Release issued by the Parent on
                      November 23, 1994
</TABLE> 


         ------------------------
         *  Previously Filed.



                                        -5-

<PAGE>
 
                 [LETTERHEAD OF THERMO ELECTRON APPEARS HERE]


               THERMO ELECTRON TO EXTEND PURITAN - BENNETT OFFER

WALTHAM, Mass., November 23, 1994 -- Thermo Electron Corporation (NYSE-TMO) 
announced today that it is extending its $24.50 per share, all-cash tender offer
for all of the outstanding common stock of Puritan-Bennett Corporation until 
midnight, New York City time, on Monday, November 28, 1994, unless further 
extended by Thermo Electron.

     Preliminary figures show that a total of approximately 7,818,917 shares had
been tendered through November 22, 1994, when the tender offer was originally 
scheduled to expire. The tendered shares, together with the shares already owned
by Thermo Electron, constitute approximately 67.3 percent of the outstanding 
Puritan-Bennett common stock at September 7, 1994 (62.5 percent on a fully 
diluted basis).

      "The offer is being extended to give Puritan-Bennett's board of directors 
- -- and any non-tendering shareholders -- the opportunity to consider the 
substantial support of Puritan-Bennett's shareholders for our offer as evidenced
by the significant number of shares tendered," said George N. Hatsopoulos, 
chairman and president of Thermo Electron. "We don't see how Puritan-Bennett can
continue to assert that our offer is 'not in the best interest of the company
and its stockholders' when shareholders representing more than 60 percent of the
outstanding shares have shown their support for our offer. Given the measures
that the Puritan-Bennett board has taken to resist our offer, the response of
the Puritan-Bennett shareholders is especially encouraging, and should prod the
board to begin meaningful discussions with us." Dr. Hatsopoulos expressed hope
that shareholders who had not tendered due to the opposition of the Puritan-
Bennett board would now do so in order to "send an even stronger message to the
board."

     Thermo Electron's offer includes a condition that no new severance packages
be adopted. Dr. Hatsopoulos noted that the Puritan-Bennett board of directors 
had implemented new severance benefits for its management and employees, 
including an enhanced severance package for the company's president, Burton 
Dole, subsequent to Thermo Electron's tender offer. He further stated that 
Thermo Electron does not intend to complete the acquisition at the $24.50 price 
unless these measures are repealed. Except for the extension of the expiration 
date, the existing terms and conditions (including the condition as to new 
severance benefits) will continue to apply to the tender offer. Thermo Electron 
has already obtained antitrust clearance under the Hart-Scott-Rodino Antitrust 
Improvements Act of 1976 with respect to its tender offer for Puritan-Bennett.

     Thermo Electron Corporation is a world leader in environmental monitoring 
and analysis instruments and a major manufacturer of biomedical products 
including heart-assist devices and mammography systems, papermaking and 
recycling equipment, alternative-energy systems, and other specialized products.
The company also provides environmental and metallurgical services and conducts 
advanced technology research and development. With annual worldwide sales of 
more that $1 billion, Thermo Electron has approximately 10,000 employees and 
operations in 14 countries. Headquarters are in Waltham, Massachusetts.

                                      ###



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