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:
Mar. 04, 1986
Filed:
Jun. 21, 1984
Applicant:
Inventors:
Roderick G Ryles, Stamford, CT (US);
Albert G Robustelli, Darien, CT (US);
Assignee:
American Cyanamid Company, Stamford, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166275 ; 252 / ;
Abstract
Copolymers of 2-acrylamido-2-methylpropane sulfonic acid or its salts are used to maintain the viscosity of aqueous solutions thereof in the presence of divalent salt containing-waters during the enhanced recovery of petroleum from sub-terranean petroleum-bearing deposits.