APPLIED SCIENCE & TECHNOLOGY INC
SC 13G/A, 1999-02-12
SPECIAL INDUSTRY MACHINERY, NEC
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- --------------------------------------------------------------------------------
                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549
- --------------------------------------------------------------------------------

                                 SCHEDULE 13G
                                (Rule 13d-102)

            INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
            TO RULES 13d-1(b)(c), AND (d) AMENDMENTS THERETO FILED
                           PURSUANT TO RULE 13d-2(b)

                              (Amendment No. 5)*


                     Applied Science and Technology, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)


                         Common Stock, $.01 par value
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                  038236 10 5
                        ------------------------------
                                 (CUSIP Number)


                               December 31, 1998
- --------------------------------------------------------------------------------
            (Date of Event Which Requires Filing of this Statement)


Check the appropriate box to designate the rule pursuant to which this Schedule 
is filed:

     [_] Rule 13d-1(b)

     [_] Rule 13d-1(c)

     [X] Rule 13d-1(d)


     *The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter the disclosures provided in a prior cover page.

      The information required in the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).

                               Page 1 of 6 pages
<PAGE>
 
- ---------------------                                          -----------------
CUSIP NO. 038236 10 5                   13G                    Page 2 of 6 Pages
- ---------------------                                          -----------------
      NAMES OF REPORTING PERSONS
 1    I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
                                                                                
      Richard S. Post, Ph.D.
                          
- ------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------ 
3     SEC USE ONLY
             
             
             
- ------------------------------------------------------------------------------ 
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 
      United States

- ------------------------------------------------------------------------------
                         SOLE VOTING POWER
                     5                                                      
  NUMBER OF              642,102 shares (which includes 83,900 shares of Common
                         Stock underlying stock options which are exercisable 
   SHARES                within sixty (60) days of February 8, 1999).          
                   -----------------------------------------------------------
BENEFICIALLY             SHARED VOTING POWER
                     6       
  OWNED BY               -0-
                
   EACH           -----------------------------------------------------------
                         SOLE DISPOSITIVE POWER
 REPORTING           7       
                         642,102 shares (which includes 83,900 shares of Common 
  PERSON                 Stock underlying stock options which are exercisable   
                         within sixty (60) days of February 8, 1999).           
   WITH            -----------------------------------------------------------
                         SHARED DISPOSITIVE POWER
                     8       
                         -0-

- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      642,102 shares (which includes 83,900 shares of Common Stock underlying
      stock options which are exercisable within sixty (60) days of
      February 8, 1999).
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
10    
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      7.3% (based on 8,669,309 shares outstanding as of February 8, 1999).

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12           
      IN
- ------------------------------------------------------------------------------
                    * SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 2 of 6 pages
<PAGE>
 

Item 1(a).  Name of Issuer:
            ---------------

Applied Science and Technology, Inc.


Item 1(b).  Address of Issuer's Principal Executive Offices:
            ------------------------------------------------

35 Cabot Road, Woburn, MA   01801


Item 2(a).  Name of Person Filing:
            ----------------------

Richard S. Post, Ph.D.


Item 2(b).  Address of Principal Business Office or, if None, Residence:
            ------------------------------------------------------------

35 Cabot Road, Woburn, MA   01801


Item 2(c).  Citizenship:
            ------------

United States


Item 2(d).  Title of Class of Securities:
            -----------------------------

Common Stock, $.01 par value

 
Item 2(e).  CUSIP Number:
            --------------

038236 10 5

Item 3.     If This Statement is Filed Pursuant to Rule 13d-1(b), or 13d-2(b) or
            --------------------------------------------------------------------
            (c), Check Whether the Person Filing is a:
            ------------------------------------------

            (a)   [_]   Broker or dealer registered under Section 15 of the 
                        Exchange Act. 
 
            (b)   [_]   Bank as defined in Section 3(a)(6) of the Exchange Act.
 

            (c)   [_]   Insurance company as defined in Section 3(a)(19) of the
                        Exchange Act. 


            (d)   [_]   Investment company registered under Section 8 of the 
                        Investment Company Act.  

                               Page 3 of 6 pages
<PAGE>

            (e)   [_]   An investment adviser in accordance with 
                        Rule 13d-1(b)(1)(ii)(E).  


            (f)   [_]   An employee benefit plan or endowment fund in 
                        accordance with Rule 13d-1(b)(1)(ii)(F).  


            (g)   [_]   A parent holding company or control person in 
                        accordance with Rule 13d-1(b)(1)(ii)(G).

 
            (h)   [_]   A savings association as defined in Section 3(b) of 
                        the Federal Deposit Insurance Act.  


            (i)   [_]   A church plan that is excluded from the definition of 
                        an investment company under Section 3(c)(14) of the 
                        Investment Company Act. 


            (j)   [_]   Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

   
            If this statement is filed pursuant to Rule 13d-1(c), check this 
            box.  [_]
 
Item 4.     Ownership
            ---------

      (a)   Amount beneficially owned: 642,102 shares (which includes 83,900
shares of Common Stock underlying stock options which are exercisable within
sixty (60) days of February 8, 1999).

      (b)   Percent of class: 7.3% (based on 8,669,309 shares outstanding as of
February 8, 1999).

      (c)   Number of shares as to which such person has:

            (i)   sole power to vote or to direct the vote: 642,102 shares
(which includes 83,900 shares of Common Stock underlying stock options which are
exercisable within sixty (60) days of February 8, 1999).

            (ii)  shared power to vote or to direct the vote:  -0-

            (iii) sole power to dispose or to direct the disposition of:
642,102 shares (which includes 83,900 shares of Common Stock underlying stock
options which are exercisable within sixty (60) days of February 8, 1999).

            (iv)  shared power to dispose or to direct the disposition of: -0-

                               Page 4 of 6 pages
<PAGE>
 
Item 5.   Ownership of Five Percent or Less of a Class
          --------------------------------------------

     If this statement is being filed to report the fact that as of the date
hereof the reporting person has ceased to be the beneficial owner of more than
five percent of the class of securities, check the following [  ].
 
Not Applicable.


Item 6.   Ownership of More than Five Percent on Behalf of Another Person
          ---------------------------------------------------------------
 
Not Applicable.


Item 7.   Identification and Classification of the Subsidiary Which Acquired the
          ----------------------------------------------------------------------
          Security Being Reported on by the Parent Holding Company
          --------------------------------------------------------

Not Applicable.


Item 8.   Identification and Classification of Members of the Group
          ---------------------------------------------------------

Not Applicable.


Item 9.   Notice of Dissolution of Group
          ------------------------------

Not Applicable.


Item 10.  Certification
          -------------

Not Applicable.

                               Page 5 of 6 pages
<PAGE>

                                    SIGNATURE

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

 
                                                    RICHARD S. POST, PH.D.



Date:   February 12, 1999                       By: /s/ Richard S. Post
                                                    --------------------------
                                                    Richard S. Post, Ph.D.
                                                    President

                               Page 6 of 6 pages


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