THERMOTREX CORP
POS AM, 1998-09-10
X-RAY APPARATUS & TUBES & RELATED IRRADIATION APPARATUS
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  As filed with the Securities and Exchange Commission on September 10, 1998

                                                     Registration No. 33-68654

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    Form S-3
                         Post-Effective Amendment No. 1
                                       To
                             Registration Statement
                                      Under
                           The Securities Act of 1933

                             ThermoTrex Corporation
               (Exact name of registrant as specified in charter)

      Delaware                                         52-1711436
(State or other jurisdiction of             (IRS Employer Identification Number)
 incorporation or organization)

                           10455 Pacific Center Court
                           San Diego, California 92121
                                 (619) 646-5300
    (Address, including zip code, and telephone number, including area code,
                  of registrant's principal executive offices)

                          Sandra L. Lambert, Secretary
                             ThermoTrex Corporation
                         c/o Thermo Electron Corporation
                                 81 Wyman Street
                                  P.O. Box 9046
                        Waltham, Massachusetts 02454-9046
                                 (781) 622-1000
            (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)

                                   Copies to:
                             Seth H. Hoogasian, Esq.
                                 General Counsel
                             ThermoTrex Corporation
                         c/o Thermo Electron Corporation
                                 81 Wyman Street
                                  P.O. Box 9046
                        Waltham, Massachusetts 02454-9046
                                 (781) 622-1000
                             ----------------------


<PAGE>


     Approximate  date of  commencement  of proposed sale to public:  As soon as
practicable after the Registration Statement has become effective.

     If any of the securities being registered on this form are to be offered on
a delayed or continuous  basis  pursuant to Rule 415 under the Securities Act of
1933, check the following box. [X]

     If this form is filed to  register  additional  securities  for an offering
pursuant to Rule 462(b) under the  Securities  Act of 1933,  check the following
box and list the Securities  Act  registration  statement  number of the earlier
effective registration statement for the same offering. [ ]

     If this form is a  post-effective  amendment  filed pursuant to Rule 462(c)
under  the  Securities  Act of  1933,  check  the  following  box and  list  the
Securities  Act  registration   statement   number  of  the  earlier   effective
registration statement for the same offering. [ ]

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


     This  post-effective   amendment  removes  from  registration  any  of  the
securities  which  remained  unsold  as of  the  date  of  the  filing  of  this
post-effective amendment. The registration is hereby terminated.

<PAGE>


                                   SIGNATURES

     Pursuant to the requirements of the Securities Act, the Registrant has duly
caused this Post-Effective Amendment No. 1 to Registration Statement on Form S-3
(Reg.  No.  33-68654) to be signed on its behalf by the  undersigned,  thereunto
duly  authorized,  in the City of San  Diego,  California,  on this  10th day of
September, 1998. 

                                 THERMOTREX CORPORATION


                                 By:    /s/ Gary S. Weinstein
                                        Gary S. Weinstein
                                        Chairman and Chief Executive Officer

Signature                        Title                      Date
- ---------                        -----                      ----
/s/ Gary S. Weinstein            Chief Executive Officer,   September 10, 1998 
- -------------------------        Chairman of the Board and
Gary S. Weinstein                Director (Principal
                                 Executive Officer)

/s/ John N. Hatsopoulos*         Chief Financial Officer    September 10, 1998
- -------------------------        and Senior Vice President  
John N. Hatsopoulos              (Principal Financial
                                 Officer)

/s/ Paul F. Kelleher*            Chief Accounting Officer   September 10, 1998
- -------------------------        (Principal Accounting
Paul F. Kelleher                  Officer)
                                    

- -------------------------        Director                   September 10, 1998
Morton Collins

/s/ Peter O. Crisp*              Director                   September 10, 1998
- -------------------
Peter O. Crisp

/s/ Paul F. Ferrari*             Director                   September 10, 1998
- --------------------
Paul F. Ferrari

/s/ George N. Hatsopoulos*       Director                   September 10, 1998
- --------------------------
George N. Hatsopoulos

/s/ Robert C. Howard*            Director                   September 10, 1998
- ---------------------
Robert C. Howard

                                 Director                   September 10, 1998
- ------------------------
Nicholas T. Zervas

*By: /s/ Seth H. Hoogasian
     -------------------------
     Seth H. Hoogasian
     Attorney-in-Fact





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