CUSIP No. 703395103  	                                              13G/A  	Page 1 of 5 Pages  	
 	
UNITED STATES	
SECURITIES AND EXCHANGE COMMISSION	
Washington, D.C. 20549	
	
SCHEDULE 13G/A	
	
Under the Securities Exchange Act of 1934	
	
(Amendment No. 2)*	
	
Patterson Companies, Inc.	
( Name of Issuer)	
	
Common Stock, $0.01 par value	
(Title of Class of Securities)	
	
703395103	
(CUSIP Number)	
	
December 31, 2009	
(Date of Event Which Requires Filing of this Statement)	
	
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:  	
   X      Rule 13d-1(b)  	 	 	
            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).  	 	 	

				
CUSIP No. 703395103  	13G/A  	Page 2 of 5 Pages  	
 	
            1. Name of Reporting Persons.  	 	 	
                I.R.S. Identification No. of above persons (entities only).  	 	
 	
                Delaware Charter Guarantee & Trust Company dba Principal Trust Company as  	
                Trustee for the Patterson Companies, Inc. Employee Stock Ownership Plan, IRS No.  	
                 51-0099493.  	 	 	

            2. Check the Appropriate Box if a Member of a Group:  	 	
 	
                      (a)  	 	 	 	
 	
                      (b)  	 	 	 	

            3. SEC Use Only  	 	 	

            4. Citizenship or Place of Organization:     Delaware  	 	
 	
  Number of Shares Beneficially Owned by Each Reporting Person With:  	 	
 	
 	5. Sole Voting Power:  	 	 	
 	          0  	 	 	
 		
Number of	6. Shared Voting Power:  	 	 	
Shares	          19,871,875  	 	 	
Beneficially		
Owned By	7. Sole Dispositive Power:  	 	 	
Each	          0  	 	 	
Reporting		
Person With:	8. Shared Dispositive Power:  	 	
 	          19,871,875  	 	 	

            9. Aggregate Amount Beneficially owned by Each Reporting Person       19,871,875	 	

            10. Ch eck if Aggregate Amount in Row (9) Excludes Certain Shares:  	 	

            11. Percent of Class Represented by Amount in Row (9):       16.18%  	 	

            12. Type of Reporting Person:   EP	 	 	

				
CUSIP No. 703395103  	13G/A  	Page 3 of 5 Pages  	
 	
Item 1.  	 	 	 	
 	
(a) Name of Issuer:  	 	Patterson Companies, Inc.  	
(b) Address of Issuer’s Principal Executive Offices:  	1031 Mendota Heights Road  	
 	 	 	Saint Paul, MN 55120-1419  	
 	
Item 2.  	 	 	 	
 	
(a) – (c) Name, Principal Business Address and Citizenship of Person Filing:  	
 	
          Delaware Charter Guarantee & Trust Company dba Principal Trust Company as Trustee  	
          for the Patterson Companies, Inc. Employee Stock Ownership Plan  	
          1013 Centre Road  	 	 	
          Wilmington, Delaware 19805  	 	 	
 	
          Citizenship:  	Delaware  	 	 	
 	
(d) Title of Class of Securities:  	Common Stock, $0.01 par value  	
 	
(e) CUSIP Number:  	703395103  	 	
 	
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:  	 	 	 	
 	
(f) An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F);  	
 	
Item 4. Ownership - Provide the following information regarding the aggregate number and  	
percentage of the class of securities of the issuer identified in Item 1.  	
 	
(a)     The Patterson Companies, Inc. Employee Stock Ownership Plan (“Plan”) is subject to the  	
          Employee Retirement Income Security Act of 1974 (“ERISA”). Delaware Charter Guarantee  	
          & Trust Company dba Principal Trust Company acts as the Trustee of the Patterson  	
          Companies, Inc. Employee Stock Ownership Plan Trust (“Trust”). As of December 31, 2009,  	
          the Plan held 19,871,875 shares of the Issuer’s common stock. The securities reported  	
          include all shares held of record by the Trustee. The Trustee follows the directions of the  	
          Issuer and/or Plan participants with respect to voting and disposition of shares. The Trustee,  	
          however, is subject to fiduciary duties under ERISA. The Trustee disclaims beneficial  	
          ownership of the shares of common stock that are the subject of this Schedule 13G.  	
 	
(b)     The 19,871,875 shares of common stock represent 16.18% of the Issuer’s outstanding shares  	
          of common stock. The percent of class is based on shares outstanding as of December 31,  	
          2009, as provided by the Issuer.  	 	 	

			
CUSIP No. 703395103  	13G/A  	Page 4 of 5 Pages  	

(c)      	Number of shares as to which such person has:	
 	(i)      	Sole power to vote or direct the vote: 0	
 	(ii)      	Shared power to vote or direct the vote: 19,871,875	
 	(iii)      	Sole power to dispose or direct the disposition of: 0	
 	(iv)      	Shared power to dispose or direct the disposition of: 19,871,875	
Item      	5. Ownership of Five Percent or Less of Class	
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
By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of having or influencing the control of the issuer of the securities and are not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

			
  CUSIP No. 703395103  	    13G/A  	Page 5 of 5 Pages  	

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.  	 	

 	Delaware Charter Guarantee & Trust Company  	

 	/s/ Kristin M. Camp_________________  	
 	Kristin M. Camp  	 	
 	Director, Trust Services  	 	
 	February 8, 2010