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. 26, 1991
Filed:
Jan. 08, 1990
Applicant:
Inventors:
Steven J Behrend, Naperville, IL (US);
David A Young, Warrenville, IL (US);
Ellis K Fields, River Forest, IL (US);
Assignee:
Amoco Corporation, Chicago, IL (US);
Primary Examiner:
Int. Cl.
CPC ...
C07D / ; C07D / ; C07D / ;
U.S. Cl.
CPC ...
549232 ; 549234 ; 549240 ; 549241 ; 549252 ; 549253 ;
Abstract
A process is disclosed for preparation of anhydrides containing additional carboxylic acid moieties and dianhydrides of disubstituted maleic anhydride compounds wherein the acid anhydrides and dianhydrides retain their alkene character. The resulting alkene compounds are useful as precursors for polyesters, thermally stable polyamide-imides and polyimides which are also disclosed, as well as a process for their preparation.