The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 07, 1987
Filed:
Dec. 14, 1984
Applicant:
Inventors:
Lyle F Elmquist, St. Paul, MN (US);
Warren W Howland, Champlin, MN (US);
Curtis L Karl, Minneapolis, MN (US);
Assignee:
Henkel Corporation, Minneapolis, MN (US);
Primary Examiner:
Int. Cl.
CPC ...
E21B / ; C08F / ;
U.S. Cl.
CPC ...
252-8551 ; 166308 ; 252-8553 ; 406 48 ; 525360 ; 525370 ; 525371 ;
Abstract
A thickener composition is comprised of a polymer having as the major recurring structural unit an acrylamidoalkanesulfonic acid or derivative thereof and a polyvalent metal crosslinking agent is provided. The compositions are useful for thickening aqueous solutions within a specified range of pH. The thickener is effective even in aqueous compositions having high levels of electrolytes.