EXHIBIT 10.20



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|Docket No.:617.004USP                                                                                      |  | 
|Serial No.: 60/900,374 Filing Date: February 8,
2007 Title: SYSTEMS PROVIDING AT LEAST PESTICIDAL ACTIVITY |  | 

ASSIGNMENT

WHEREAS, I, Kenneth R. Code, residing at 1780 Glastonbury Boulevard #4, Edmonton, Alberta, Canada T5T 6P9, made certain new and useful inventions and improvements for which I executed an application for
Letters Patent of the United States which is entitled SYSTEMS PROVIDING AT LEAST PESTICIDAL ACTIVITY, and hereby assigns US Provisional Patent Application Serial No.: 60/900,374, filed on February 8, 2007,and all
applications claiming priority therefrom.

AND WHEREAS, BioLargo Life Technologies, Incorporated, a corporation organized and
existing under and by virtue of the laws of the State of California, and having an office and place of business at 2603 Main Street, Suite 1155, Irvine California 92614(hereinafter Assignee) is desirous of acquiring the
entire right, title and interest in and to said inventions, improvements and application and in and to the Letters Patent to be obtained therefor;

NOW, THEREFORE, to all whom it may concern, be it known that for good and valuable consideration, the receipt and sufficiency whereof is hereby acknowledged, I have sold, assigned, and transferred, and by these presents do sell, assign and
transfer unto said Assignee, its successors or assigns, the entire right, title and interest for all countries in and to all inventions and improvements disclosed in the aforesaid application, and in and to the said application, all divisions,
continuations, continuations-in-part, renewals or any application throughout the world claiming priority that includes the US Provisional Patent Application thereof, all Letters Patent which may be granted therefrom, and all reissues or extensions
of such patents, and in and to any and all applications which have been or shall be filed in any foreign countries for Letters Patent on the said inventions and improvements, including an assignment of all rights under the provisions of the
International Convention, and all Letters Patent of foreign countries which may be granted therefrom; and I do hereby authorize and request the Commissioner of Patents and Trademarks to issue any and all United States Letters Patent for the
aforesaid inventions and improvements to the said Assignee as the assignee of the entire right, title and interest in and to the same, for the use of the said Assignee, its successors and assigns.



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|Docket No.:617.004USP Serial No.: 60/900,374
Filing Date: February 8, 2007 Title: SYSTEMS PROVIDING AT LEAST PESTICIDAL
ACTIVITY |  | Page 2 of 2

AND, for the consideration aforesaid, I do hereby agree that we and our executors and legal
representatives will make, execute and deliver any and all other instruments in writing including any and all further application papers, affidavits, assignments and other documents, and will communicate to said Assignee, its successors and
representatives all facts known to me relating to said improvements and the history thereof and will testify in all legal proceedings and generally do all things which may be necessary or desirable more effectually to secure to and vest in said
Assignee, its successors or assigns the entire right, title and interest in and to the said improvements, inventions, applications, Letters Patent, rights, titles, benefits, privileges and advantages hereby sold, assigned and conveyed, or intended
so to be.

AND, furthermore I covenant and agree with said Assignee, its successors and assigns, that no assignment, grant, mortgage,
license or other agreement affecting the rights and property herein conveyed has been made to others by me and that full right to convey the same as herein expressed is possessed by me.

IN TESTIMONY WHEREOF, I have hereunto set my hand this 20thday of April, 2007.



|                                     |  |  |  |                                                                 
|------------------------------------ |  |  |  | ----------------------------------------------------------------
|                                     |  |  |  | /S/ Kenneth R. Code                                             
|                                     |  |  |  | Name: Kenneth R. Code                                           
|CITY OF Edmonton
AB )                |  |  |  |                                                                 
|                                     |  | 
|COUNTRY OF
Canada)                   |  |  |  |                                                                 
|                                    
|Witnessed, on this  day of
, 2007 by
|                                     |  |  |  |                                                                 
|                                     |  |  |  | /S/ Judith A. Code                                              
|                                     |  |  |  | Witness                                                         
|                                     |  | 
|                                     |  |  |  | Judith A. Code                                                  
|                                     |  |  |  | Witness Name (Print)                                            
|                                     |  | 
|                                     |  |  |  | 1780 Glastonbury Boulevard #4, Edmonton, Alberta, Canada T5T 6P9
|                                     |  |  |  | Witness Address                                                 



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LOGO

UNITED STATES PATENT AND TRADEMARK
OFFICE

UNDER SECRETARY OF COMMERCE FOR
INTELLECTUAL PROPERTY AND

DIRECTOR OF THE
UNITED STATES PATENT AND TRADEMARK OFFICE

APRIL 25, 2005

PTAS

MARK A. LITMAN

MARK A. LITMAN & ASSOCIATES, P.A.

YORK BUSINESS CENTER

3209 WEST 76TH ST, SUITE 205

EDINA, MN 55435

UNITED STATES PATENT AND TRADEMARK OFFICE

NOTICE OF RECORDATION OF ASSIGNMENT DOCUMENT

THE ENCLOSED DOCUMENT HAS BEEN RECORDED BY THE ASSIGNMENT DIVISION OF THE U.S. PATENT AND TRADEMARK
OFFICE. A COMPLETE MICROFILM COPY IS AVAILABLE AT THE ASSIGNMENT SEARCH ROOM ON THE REEL AND FRAME NUMBER REFERENCED BELOW.

PLEASE REVIEW ALL INFORMATION
CONTAINED ON THIS NOTICE. THE INFORMATION CONTAINED ON THIS RECORDATION NOTICE REFLECTS THE DATA PRESENT IN THE PATENT AND TRADEMARK ASSIGNMENT SYSTEM. IF YOU SHOULD FIND ANY ERRORS OR HAVE QUESTIONS CONCERNING THIS NOTICE, YOU MAY CONTACT THE
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|                             |  |                        
|---------------------------- |  | -----------------------
|RECORDATION DATE: 04/24/2007 |  | REEL/FRAME: 019206/0608
|                             |  | NUMBER OF PAGES: 5     

BRIEF: ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). DOCKET NUMBER: 617.004US1

ASSIGNOR:



|                 |  |                     
|---------------- |  | --------------------
|CODE, KENNETH R. |  | DOC DATE: 04/20/2007

ASSIGNEE:

BIOLARGO LIFE TECHNOLOGIES,

INCORPORATED

2603 MAIN STREET, SUITE 1155

IRVINE, CALIFORNIA 92614



|                        |  |                        
|----------------------- |  | -----------------------
|SERIAL NUMBER: 60900374 |  | FILING DATE: 02/08/2007
|PATENT NUMBER:          |  | ISSUE DATE:            



P.O. Box 1450. Alexandria. Virginia 223131450 -
WWW.USPTO.GOV



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019206/0608 PAGE 2

ASSIGNMENT SERVICES BRANCH

PUBLIC RECORDS DIVISION