Document:

Exhibit 10.13

NORTHERN TECHNOLOGIES INTERNATIONAL CORPORATION

DESCRIPTION OF EXECUTIVE OFFICER
 COMPENSATION ARRANGEMENTS

The following is a description of oral compensation arrangements between Northern Technologies International Corporation and the following executive officers of NTIC as of August 31, 2006:

	
  
Name of   
Executive Officer
  	
   
 	
  
Title
  	
   
 	
  
Base
   Salary
  	
   
 	
  
Bonus
   Arrangements
  	
   
 	
  
Stock
   Options
  	
   
 	
  
Other
  
	
  

  	
   
 	
  

  	
   
 	
  

  	
   
 	
  

  	
   
 	
  

  	
   
 	
  

  
	
  G. Patrick Lynch
  	
  
 
  	
  
President and Chief   Executive Officer
  	
  
 
  	
  
$190,000   per year. See footnote (1) below
  	
  
 
  	
  
See footnote (2) below
  	
  
 
  	
  
Stock options to purchase   shares of NTIC common stock are granted from time to time in the sole   discretion of the NTIC Board of Directors.
  	
  
 
  	
  
Under NTIC’s 401(k) Plan, participants, including   executive officers, may voluntarily request that NTIC reduce pre-tax   compensation by up to 15% (subject to certain special limitations) and   contribute such amounts to a trust. NTIC contributed an amount equal to 3.5%   of the amount that each participant contributed under this plan.
  
	
   
  	
  
 
  	
  
 
  	
  
 
  	
  
 
  	
  
 
  	
  
 
  	
  
 
  	
  
 
  	
  
 
  	
  
 
  
	
  
 
  	
  
 
  	
  
 
  	
  
 
  	
  
 
  	
  
 
  	
  
 
  	
  
 
  	
  
 
  	
  
 
  	
  
Executive officers receive   other benefits received by other NTIC employees, including health, dental and   life insurance benefits.
  
	 
	  
	  
	  
	  
	  
	  
	  
	  
	  
	  

	
  
Dr. Donald Kubik
  	
  
 
  	
  
Vice Chairman and Chief   Technology Officer
  	
  
 
  	
  
$170,000   per year. See footnote (1) below
  	
  
 
  	
  
See footnote (2) below
  	
  
 
  	
  
See above
  	
  
 
  	
  
See above
  
	 
	  
	  
	  
	  
	  
	  
	  
	  
	  
	  

	
  Matthew C. Wolsfeld
  	
  
 
  	
  
Chief Financial Officer   and Secretary
  	
  
 
  	
  
$145,000   per year. See footnote (1) below
  	
  
 
  	
  
See footnote (2) below
  	
  
 
  	
  
See above
  	
  
 
  	
  
See above
  

	

	
  
(1)
  	
  
Annual base salaries for   NTIC’s executive officers are determined each year by NTIC’s Compensation   Committee.

  
	
  
 
  	
  
 
  	
  
 
  
	
  (2)
  	
  Annual performance bonuses   for NTIC’s executive officers are determined each year by NTIC’s Compensation   Committee and can be comprised of cash and/or a stock bonus.Exhibit 10.18

PROMISSORY NOTE MODIFICATION AGREEMENT

THIS PROMISSORY NOTE MODIFICATION AGREEMENT (“Modification”) is dated as of January 30, 2006 but is effective as of January 30, 2006, by and between NORTHERN TECHNOLOGIES INTERNATIONAL CORPORATION (“Borrower” or, if more than one (1), collectively “Borrower”) and NATIONAL CITY BANK, a national banking association (“Bank”).

WHEREAS, Bank agreed to lend to Borrower an amount not to exceed the sum of One Million and 00/100 Dollars ($1,000,000.00)(“Loan”), which Loan was evidenced by a certain Commercial Note: Revolving Credit dated August 6, 2004 in the face amount of Five Hundred Thousand and 00/100 Dollars ($500,000.00) (as extended, amended or otherwise modified to date, the “Note”) and a Commercial Note Addendum dated August 6, 2004 (the said Note and any other instrument or document given in connection with or to secure the Loan being collectively referred to as “Loan Documents”).

WHEREAS, the parties hereto desire to modify the Note as hereinafter provided.

NOW, THEREFORE, in consideration of the foregoing promises and the covenants contained herein, the parties hereto agree as follows:

	
  
1.
  	
  
Liability of Borrower. Borrower   hereby ratifies and reconfirms Borrower’s obligations and all liability to   Bank under the terms and conditions of the Loan Documents and acknowledges   that Borrower has no defenses to or rights of set-off against Borrower’s   obligations and all liability to Bank thereunder. Borrower further   acknowledges that Bank has performed all of Bank’s obligations under the Loan   Documents.
  
	
   
  	
  
 
  
	
  
2.
  	
  
Modification. The Note is hereby   modified to provide that the maturity date be extended from January 31, 2006   to January 31, 2007.
  
	
  
 
  	
  
 
  
	
  
 
  	
  
The Commercial Note Addendum is hereby modified to   eliminate section Five (5) on page two.
  
	
  
 
  	
  
 
  
	
  
3.
  	
  
Ratification of Loan Documents.   The Loan Documents are in all respects ratified and confirmed by the parties   hereto and incorporated by reference herein, and each of the Loan Documents   and this Modification shall be read, taken and construed as one and the same   instrument. Capitalized terms used herein and not otherwise defined shall   have the meanings given to them in the Note. In the event of any conflict   between the terms and provisions of this Modification and the terms and provisions   of the Note, the terms and provisions of this Modification shall control.
  
	
  
 
  	
  
 
  
	
  
4.
  	
  
Confession of Judgment. Borrower   hereby authorizes any attorney at law to appear in any state or federal court   of record in the United States of America after the maturity hereof (whether   occurring by lapse of time or acceleration), to waive the issuance and   service of process, to admit the maturity of the Note and the amount then   appearing due, to confess judgment against Borrower in favor of the holder   hereof for the amount then appearing due,
  

	
  
 
  	
  
together with interest and costs of suit, and   thereupon to release all errors and to waive all rights of appeal and stay of   execution. No judgment shall bar any subsequent judgment. Should any judgment   be vacated for any reason, this warrant of attorney nevertheless may   thereafter be used for obtaining additional judgments.
  

IN WITNESS WHEREOF, the undersigned have caused this Modification to be executed as of the day and year first above written.

WARNING-BY SIGNING THIS PAPER YOU GIVE UP YOUR RIGHT TO NOTICE AND COURT TRIAL. IF YOU DO NOT PAY ON TIME A COURT JUDGMENT MAY BE TAKEN AGAINST YOU WITHOUT YOUR PRIOR KNOWLEDGE AND THE POWERS OF A COURT CAN BE USED TO COLLECT FROM YOU REGARDLESS OF ANY CLAIMS YOU MAY HAVE AGAINST THE CREDITOR WHETHER FOR RETURNED GOODS, FAUL TV GOODS, FAILURE ON HIS PART TO COMPLY WITH THE AGREEMENT, OR ANY OTHER CAUSE.

	
  
NORTHERN   TECHNOLOGIES
  	
  
 
  	
  
NATIONAL   CITY BANK,
  
	
  INTERNATIONAL   CORPORATION
  	
  
 
  	
  
a   national banking association
  
	
  
 
  	
  
 
  	
  
 
  	
  
 
  	
  
 
  
	
  
 
  	
  
 
  	
  
 
  	
  
 
  	
  
 
  
	
  
By:
  	
  
/s/ Matthew C. Wolsfeld
  	
  
 
  	
  
By:
  	
  
/s/ Joe McMullin
  
	
  
 
  	
  

  	
  
 
  	
  
 
  	
  

  
	
  Name:
  	
  
Matthew C. Wolsfeld
  	
  
 
  	
  
Name:
  	
  
Joe   McMullin
  
	
  
Its:
  	
  
Chief Financial Officer
  	
  
 
  	
  
Its:
  	
  
Assistant   Vice President
  

	
  
STATE   OF MINNESOTA    )
  
	
  
                                                 )   ss:
  
	
  
COUNTY   OF ANOKA         )
  

          BEFORE ME, a Notary Public in and for said County and State, personally appeared Matthew C. Wolsfeld as Chief Financial Officer of the above-named corporation, Northern Technologies International Corporation who acknowledged that he signed the foregoing instrument for an on behalf of the Corporation, and by authority of its Board of Directors, and that the same is the free act and deed of the Corporation and the free act and deed of each of them personally and as such officers.

          IN TESTIMONY, I set my hand and official seal, this 30th day of January, 2006.

	
   
  	
   
  	
  

  
	
   
  	
   
  	
  Notary Public
  

– 2 –Exhibit 10.19

PROMISSORY NOTE MODIFICATION AGREEMENT

THIS PROMISSORY NOTE MODIFICATION AGREEMENT (“Modification”) is made and entered into on August 24, 2006 but is effective as of August 24, 2006 by and among Northern Technologies International Corporation (collectively “Borrower”) and NATIONAL CITY BANK, A NATIONAL BANKING ASSOCIATION (“Bank”).

WHEREAS, Bank agreed to lend to Borrower an amount not to exceed the sum of One Million and 00/100 Dollars ($1,000,000.00) (“Loan”), which Loan was evidenced by a certain Commercial Note: Revolving Credit dated August 6, 2004 in the face amount of Five Hundred Thousand and 00/100 Dollars ($500,000.00) (as extended, amended or otherwise modified to date, the “Note”) (the said Note and any other instrument or document given in connection with or to secure the Loan being collectively referred to as “Loan Documents”).

WHEREAS, the parties hereto desire to modify the Note as hereinafter provided.

NOW, THEREFORE, in consideration of the foregoing promises and the covenants contained herein, the parties hereto agree as follows:

	
  
1.
  	
  
Liability of Borrower. Borrower   hereby ratifies and reconfirms Borrower’s obligations and all liability to   Bank under the terms and conditions of the Loan Documents and acknowledges   that Borrower has no defenses to or rights of set-off against Borrower’s   obligations and all liability to Bank thereunder. Borrower further   acknowledges that Bank has performed all of Bank’s obligations under the Loan   Documents.
  
	
   
  	
  
 
  
	
  
2.
  	
  
Modification.
  

	
  
 
  	
  
(a)
  	
  
The Note is hereby modified to provide that,   effective as of August 24, 2006 the face amount of the   Note shall be permanently increased to the sum of One Million Five Hundred Thousand and   00/100 Dollars ($1,500,000.00).
  
	
  
 
  	
  
 
  	
  
 
  
	
  
 
  	
  
(b)
  	
  
The next payment is due September 1, 2006 and monthly   thereafter as set forth in the above mentioned note. Payments prior to the   first scheduled payment above have been made as evidenced by the books and   records of Bank.
  

	
  
3.
  	
  
Ratification of Loan Documents. The   Loan Documents are in all respects ratified and confirmed by the parties   hereto and incorporated by reference herein, and each of the Loan Documents   and this Modification shall be read, taken and construed as one and the same   instrument. Capitalized terms used herein and not otherwise defined shall   have the meanings given to them in the Note. In the event of any conflict   between the terms and provisions of this Modification and the terms and   provisions of the Note, the terms and provisions of this Modification shall   control.
  
	
  
 
  	
  
 
  
	
  
4.
  	
  
Confession of Judgment. Borrower   hereby authorizes any attorney at law to appear in any state or federal court   of record in the United States of America after the maturity hereof (whether   occurring by lapse of time or acceleration), to waive the issuance and   service of process,
  

	
  
 
  	
  
to admit the maturity of the Note and the amount   then appearing due, to confess judgment against Borrower in favor of the   holder hereof for the amount then appearing due, together with interest and   costs of suit, and thereupon to release all errors and to waive all rights of   appeal and stay of execution. No judgment shall bar any subsequent judgment.   Should any judgment be vacated for any reason, this warrant of attorney   nevertheless may thereafter be used for obtaining additional judgments.
  

IN WITNESS WHEREOF, the undersigned have caused this Modification to be executed as of the day and year first above written.

WARNING-BY SIGNING THIS PAPER YOU GIVE UP YOUR RIGHT TO NOTICE AND COURT TRIAL. IF YOU DO NOT PAY ON TIME A COURT JUDGMENT MAY BE TAKEN AGAINST YOU WITHOUT YOUR PRIOR KNOWLEDGE AND THE POWERS OF A COURT CAN BE USED TO COLLECT FROM YOU REGARDLESS OF ANY CLAIMS YOU MAY HAVE AGAINST THE CREDITOR WHETHER FOR RETURNED GOODS, FAULTY GOODS, FAILURE ON HIS PART TO COMPLY WITH THE AGREEMENT, OR ANY OTHER CAUSE.

	
  
 
  	
  
Northern   Technologies International Corporation
  
	
  
 
  	
  
 
  	
  
 
  
	
  
 
  	
  
By:
  	
  
/s/ Matthew C. Wolsfeld
  
	
  
 
  	
  
 
  	
  

  
	
  
 
  	
  
 
  	
  
Matthew   C. Wolsfeld
  
	
   
  	
  
Its:
  	
  
Chief   Financial Officer
  
	
  
 
  	
  
 
  	
  
 
  
	
  
 
  	
  
 
  	
  
 
  
	
  
 
  	
  
NATIONAL   CITY BANK, A NATIONAL
  
	
  
 
  	
  
BANKING   ASSOCIATION
  
	
  
 
  	
  
 
  	
  
 
  
	
  
 
  	
  
By:
  	
  
/s/ J.R. McMullin
  
	
  
 
  	
  
 
  	
  

  
	
   
  	
   
  	
  J. R   McMullin
  
	
   
  	
  Its:
  	
  Assistant Vice President
  

– 2 –

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