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:
Oct. 18, 1994
Filed:
Dec. 08, 1993
Applicant:
Inventors:
Tohru Takekoshi, Scotia, NY (US);
Jane M Terry, Schenectady, NY (US);
Assignee:
General Electric Co., Schenectady, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528322 ; 528 15 ; 528 19 ; 528 21 ; 528 33 ; 528 37 ; 528315 ; 528319 ;
Abstract
Macrocyclic polyimide oligomers are prepared by the reaction of at least one diamine with at least one tetracarboxylic acid or dianhydride thereof in equimolar amounts, under conditions of high dilution of said reagents. The macrocyclic oligomers are capable of conversion into linear polyimides by heating with a primary amine in the presence of a macrocyclic polyimide polymerization catalyst, typically an alkaline earth or transition metal or salt thereof.