PURITAN BENNETT CORP
SC 14D1/A, 1994-12-09
ORTHOPEDIC, PROSTHETIC & SURGICAL APPLIANCES & SUPPLIES
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<PAGE>
 
                         SECURITIES AND EXCHANGE COMMISSION
                               WASHINGTON, D.C. 20549

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

                                   SCHEDULE 14D-1
                                      
                                  (Amendment No. 5)               

                               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. 5 to Tender Offer Statement on Schedule 14D-1
         ("Amendment No. 5") 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, November 22, 1994, November 23, 1994 and November 29, 1994
         (the "Original Statement").

              Pursuant to Instruction D of Schedule 14D-1, the Original
         Statement is amended and supplemented as follows:

              The Parent and Purchaser announced on December 9, 1994 that they
         allowed the Offer to expire at midnight on December 8, 1994. Attached
         as Exhibit (a)(13) and incorporated herein by reference is a copy of
         the press release issued by the Parent on December 9, 1994.
         Accordingly, the Offer has terminated and no Shares have been purchased
         thereunder by the Purchaser. In accordance with Rule 14e-1(c) under the
         Securities Exchange Act of 1934, the Purchaser shall promptly return
         all Shares and Rights tendered.

         ITEM 11.  MATERIAL TO BE FILED AS EXHIBITS.

              Item 11 is hereby amended by adding immediately following the
         reference to Exhibit (a)(12) the following:
              
              (a)(13)  Press Release issued by the Parent on December 9, 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. 5
         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: December 9, 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

         (a)(12)      Press Release issued by the Parent on             *
                      November 29, 1994
   
         (a)(13)      Press Release issued by the Parent on
                      December 9, 1994
</TABLE> 


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



                                        -5-

<PAGE>
 
           [LETTERHEAD OF THERMO ELECTRON CORPORATION APPEARS HERE]


                  THERMO ELECTRON TO LET TENDER OFFER EXPIRE

WALTHAM, Mass., December 9, 1994 - Thermo Electron Corporation (NYSE-TMO) 
announced today that its $24.50 per share, all-cash tender offer for the 
outstanding common stock of Puritan-Bennett Corporation (NASDAQ-PBEN) expired at
midnight on Thursday, December 8, 1994. Thermo Electron will not complete the 
acquisition of tendered shares because certain conditions were not fulfilled by 
the deadline, including a condition that certain anti-takeover provisions be 
made inapplicable to the tender offer by the Puritan-Bennett board of directors.

     Thermo Electron announced that preliminary figures indicate a total of 
approximately 8,369,940 shares were tendered, which, together with the shares 
already owned by Thermo Electron, constitute approximately 72 percent of the 
outstanding Puritan-Bennett common stock as of September 7, 1994 (approximately 
67 percent on a fully diluted basis). Tendered shares will be returned to 
tendering shareholders in accordance with the terms of Thermo Electron's offer 
to purchase, which was distributed to Puritan-Bennett shareholders at the 
commencement of the offer.

     "The shareholders of Puritan-Bennett have sent a clear message of support 
for our offer to the Puritan-Bennett board of directors," said George N. 
Hatsopoulos, chairman and president of Thermo Electron, "but unfortunately, the 
board has ignored that message." He explained that "completion of the tender 
offer was not feasible, given the continued refusal of the board of directors to
remove Puritan-Bennett's anti-takeover devices." Dr. Hatsopoulos added that 
should the Puritan-Bennett board change its position in the future, Thermo 
Electron would still be interested in discussing the possibility of an 
acquisition.

     Thermo Electron 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 sales of more than $1
billion, Thermo Electron has approximately 10,000 employees and operations in 14
countries. Headquarters are in Waltham, Massachusetts.


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