N-VIRO INTERNATIONAL CORP
SC 13G, 1998-12-21
PATENT OWNERS & LESSORS
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<PAGE>
 
                                UNITED STATES 
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549


                                 SCHEDULE 13G


                   Under the Securities Exchange Act of 1934

                              (Amendment No.  )*

                       N-VIRO INTERNATIONAL CORPORATION
                               (Name of Issuer)


                                 COMMON STOCK
                        (Title of Class of Securities)


                                   62944W207
                                (CUSIP Number)


                               December 11, 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)
[X] Rule 13d-1(c)
[_] 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 5 pages
<PAGE>
 

  CUSIP No. 62944W207                 13G                    Page 2 of 5 Pages

 
- ------------------------------------------------------------------------------
      NAMES OF REPORTING PERSONS.
 1    I.R.S. IDENTIFICATION NOs. OF ABOVE PERSONS.
                                                                                
      KEVIN D. CLARK
                          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 

      WISCONSIN, U.S.A.
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            
                          163,500
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          
     OWNED BY             None
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             
                          163,500
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          None
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      163,500
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
10    (SEE INSTRUCTIONS)
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
                                                                         
      6.5%
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
12           
      
      IN
- ------------------------------------------------------------------------------

 
<PAGE>
 
CUSIP NUMBER 62944W207                                         Page 3 Of 5 Pages


Item 1.
     (a) Name of Issuer: N-Viro International Corporation
         --------------

     (b) Address of Issuer's Principal Executive Offices:
         -----------------------------------------------
         3450 West Central Avenue, Suite 328
         Toledo, OH 43606

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

     (b) Address of Principal Business Office:
         ------------------------------------
         Heartland Advisors, Inc.
         790 North Milwaukee Street
         Milwaukee, WI 53202

     (c) Citizenship: USA
         -----------

     (d) Title of Class of Securities: Common Stock
         ----------------------------

     (e) CUSIP Number: 62944W207
         ------------

Item 3. If this statement is filed pursuant to (S)(S) 240.13d-1(b) or 
        -------------------------------------------------------------
         240.13d-2(b) or (c), check whether the person filing is a:
         ----------------------------------------------------------

   (a)____  Broker or Dealer registered under Section 15 of the
            Act (15 U.S.C. 78o).

   (b)____  Bank as defined in Section 3(a)(6) of the Act (15 U.S.C. 78c).


   (c)____  Insurance company as defined in Section 3(a)(19) of the Act 
            (15 U.S.C. 78c).

   (d)____  Investment company registered under section 8 of the Investment 
            Company Act of 1940 (15 U.S.C. 80a-8).


   (e)____  An investment adviser in accordance with (S) 240.13d-1(b)(1)(ii)(E).

   (f)____  An employee benefit plan or endowment fund in accordance with
            (S) 240.13d-1(b)(1)(ii)(F).

<PAGE>
                      
     (g)____   A parent holding company or control person in accordance with 
               (S)240.13d-1(b)(ii)(G);

     (h)____   A savings association as defined in Section 3(b) of the 
               Federal Deposit Insurance Act (12 U.S.C. 1813);

     (i)____   A church plan that is excluded from the definition of an
               investment company under section 3(c)(14) of the Investment
               Company Act of 1940 (15 U.S.C. 80a-3);

     (j)____   Group, in accordance with (S)240.13d-1(b)(1)(ii)(J).


   If this statement is filed pursuant to (S)240.13d-1(c), check this box [ ].

   Item 4. Ownership.
           ---------

       (a)  Amount beneficially owned:
            -------------------------
            163,500 shares may be deemed beneficially owned within the meaning
   of Rule 13d-3 of the Securities Exchange Act of 1934 by Kevin D. Clark.

       (b)  Percent of Class:
            ----------------
            6.5%

       (c)  For information on voting and dispositive power with respect to the 
   above listed shares, see Items 5-8 of the Cover 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: [ ]

   Item 6. Ownership of more than Five Percent on Behalf of Another Person.
           ---------------------------------------------------------------

           The shares of common stock to which this Schedule relates are held 
   by Kevin D. Clark. As a result, Mr. Clark has the right to receive or the 
   power to direct the receipt of dividends from, or the proceeds from the
   sale of, the securities.

   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.      
                                 
<PAGE>
 
Item 9.   Notice of Dissolution of Group.
          ------------------------------

          Not Applicable.

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

          By signing below I certify that, to the best of my knowledge and 
belief, the securities referred to above were not acquired and are not held for 
the purpose of or with the effect of changing or influencing the control of the 
issuer of the securities and were not acquired and are not held in connection 
with or as a participant in any transaction having that purpose or effect.

                                   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.



DATE:     December 21, 1998


                        KEVIN D. CLARK


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