FIRST BANK SYSTEM INC
SC 13G, 1996-08-08
NATIONAL COMMERCIAL BANKS
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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.  )*


                             Patterson Dental Co.
                      ------------------------------------
                                (Name of Issuer)

                                    Common
                      ------------------------------------
                         (Title of Class of Securities)

                                  703412-10-6
                                  -----------
                                 (CUSIP Number)


Check the following box if a fee is being paid with this statement. [X] (A fee
is not required only if the filing person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7.)

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).

 


                               
SEC 1745 (10-88)               Page 1 OF 6 Pages
<PAGE>
 
- -----------------------                                  ---------------------
CUSIP NO.  703412-10-6               13G                   Page 2 OF 6 Pages
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
 1    NAME OF REPORTING PERSON S.S. or I.R.S.
      IDENTIFICATION NO. OF ABOVE PERSON
                                                                                
      First Bank System Inc.
      601 2nd Ave. South
      Minneapolis, MN 55402-4302
      Tax I.D. No.: 41-0255900
- ------------------------------------------------------------------------------
 2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                (a) [_]
                                                                (b) [_]
- ------------------------------------------------------------------------------
 3    SEC USE ONLY
 

- ------------------------------------------------------------------------------
 4    CITIZENSHIP OR PLACE OF ORGANIZATION
                                  
      Delaware, U.S.A.

- ------------------------------------------------------------------------------
                     5    SOLE VOTING POWER
                                                                            
     NUMBER OF            54,075
 
      SHARES       -----------------------------------------------------------
                     6    SHARED VOTING POWER
   BENEFICIALLY             
                          2,787,229 /1/     
     OWNED BY
                   -----------------------------------------------------------
       EACH          7    SOLE DISPOSITIVE POWER
                            
    REPORTING             33,575
 
      PERSON       -----------------------------------------------------------
                     8    SHARED DISPOSITIVE POWER
       WITH                 
                          2,787,729 /1/
- ------------------------------------------------------------------------------
 9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                            
                          2,841,304 /1/
- ------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
           
 
 
- ------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
           
                          16.06%      

- ------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON*
            
      H.C.     

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

                     SEE INSTRUCTION BEFORE FILLING OUT!

- ------------------
/1/  This number includes 2,785,024.70 shares held in the "unallocated account",
as of July 31, 1996, of the Patterson Dental Company Employee Stock Ownership
Plan and Trust, for which an affiliate of First Bank System, Inc. acts as
trustee. The number of "allocated" shares held in such trust (1,052,058.30
shares as of July 31, 1996) is not included in this number, based upon our
interpretation of SEC staff no-action letters.
<PAGE>
                                                             Page 3 of 6 pages

Item 1
       a.      Name of Issuer:

               Patterson Dental Co.         

       b.      Address of Issuer's Principal Executive Offices:

               Patterson Dental Co.
               1031 Mendota Heights Road
               St. Paul, Minnesota 55120
             
Item 2

       a.      Name of Person Filing:

               First Bank System, Inc.
             
       b.      Address of Principal Business Office:

               601 2nd Ave South
               Minneapolis, MN 55402-4302
               United States
             
       c.      Title of Class of Securities:

               COMMON
        
       d.      CUSIP Number:

               703412-10-6
   
Item 3        
               The person filing this statement is a: 
               (g) [X] Parent Holding Company


Item 4         
               Ownership:

               a.  Amount beneficially owned:                    2,841,304 /1/  
               b.  Percentage of Class:                              16.06%
               c.  Number of shares as to which such person has:

                   1.  Sole power to vote or direct the vote:       54,075
                   2.  Shared power to vote or direct vote:      2,787,229 /1/
                   3.  Sole power to dispose or direct the 
                       disposition:                                 33,575
                   4.  Shared power to dispose or direct the 
                       disposition:                              2,787,729 /1/

Item 5         
               Ownership of Five Percent or Less of a Class:  (   )

             
- ---------------------
/1/ This number includes 2,785,024.70 shares held in the "unallocated account",
as of July 31, 1996, of the Patterson Dental Company employee Stock Ownership
Plan and Trust, for which an affiliate of First Bank System, Inc. acts as
trustee. The number of "allocated" shares held in such trust (1,052,058.30
shares as of July 31, 1996) is not included in this number, based upon our
interpretation of SEC staff no-action letters.
<PAGE>
 
                                                                     Page 4 of 6

Item 6
          Ownership of More than Five Percent on Behalf of Another Person:

          Other persons have the right to receive or the power to direct the
          receipt of, dividend from, or the proceeds from the sale of, such
          securities. To our knowledge no interest of any such person relates to
          more than 5% of the class.

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

          See Exhibit A


Item 8    
          Identification and Classification of Members of the Group:

          Not Applicable

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 acquired in the ordinary course of business
and were not acquired for the purpose of and do not have the effect of changing
or influencing the control of the issuer of such securities and were not
acquired in connection with or as a participant in any transaction having such
purposes 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.


Dated:  August 8, 1996


/s/ Sarah J. Burckhardt
- ------------------------------
Sarah J. Burckhardt
Assistant Vice President
<PAGE>
 
                                                                     Page 5 of 6

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington D. C. 20549

                                  SCHEDULE 13G
                   Under the Securities Exchange Act of 1934

                                   EXHIBIT A

The Schedule to which this attachment is appended is filed on behalf of the
following subsidiary or subsidiaries listed below, which are classified as banks
for the purposes of 17 CFR 140.13d-1 (b) (ii) (B).
 
  First Bank National Association      First Trust National Association
  601 2nd Ave South                    180 East Fifth Street, Suite 200
  Minneapolis, Minnesota 55402-4302    St. Paul, Minnesota 55101
 
  First Bank National Association
  400-410 North Michigan Avenue
  Chicago, IL 60611
<PAGE>

                                                                     Page 6 of 6
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G

                             EXHIBIT B - DISCLAIMER

Information on the attached Schedule 13G is provided solely for the purpose of
complying with Section 13(d) and 13(g) of the Securities Exchange Act of 1934
and Regulations promulgated under authority thereof and is not intended as an
admission that First Bank System, Inc. or any of its subsidiaries, is a
beneficial owner of the securities described herein for any other purpose
(including without limitation for purposes of the Minnesota Control Share
Acquisition Act).


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