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:
Nov. 03, 1992
Filed:
May. 25, 1990
Applicant:
Inventors:
John A Schield, Chesterfield, MO (US);
Michael I Naiman, St. Louis, MO (US);
Gary A Scherubel, St. Louis, MO (US);
Assignee:
Petrolite Corporation, St. Louis, MO (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ; C07D / ; C08F / ;
U.S. Cl.
CPC ...
252-8551 ; 526262 ; 525 66 ; 548521 ; 548522 ;
Abstract
A clayish formation, such as encountered in rock surrounding an oil well bore, is stabilized with a quaternary ammonium salt of an imide of polymaleic anhydride. The invention is particularly relevant to hydraulic fracturing fluids used for enhanced oil recovery.
Schield, John. (1992). Polyimide quaternary salts as clay stabilization agents (U.S. Patent No. 5160642). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5160642
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile