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:
Dec. 07, 1976
Filed:
Jul. 15, 1974
Applicant:
Inventors:
John D Hand, Pittsfield, MA (US);
Wendell G Whitehouse, Pittsfield, MA (US);
Assignee:
General Electric Company, Schenectady, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
260 / ; 260 / ; 260 42 ; 260 4218 ; 260 / ; 260 / ; 428474 ;
Abstract
Novel polyimide prepolymers with improved mold flow characteristics and enhanced physical properties when thermoset, are provided by heating a difunctional amine and an anhydride of an unsaturated dicarboxylic acid in a solvent at a temperature not in excess of 75.degree. C. until all of the amine groups are reacted, then, without isolating the reaction product, heating it with more difunctional amine in a solvent at a temperature not in excess of 75.degree. C. until formation of a prepolymer is substantially complete.