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. 29, 1977
Filed:
Apr. 18, 1975
Applicant:
Inventors:
Yasuhiro Suzuki, Ibaraki, JA;
Toshihide Okamoto, Ibaraki, JA;
Yuzuru Noda, Ibaraki, JA;
Makoto Kojima, Ibaraki, JA;
Assignee:
Nitto Electric Industrial Co., Ltd., Ibaraki, JA;
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
260 / ; 260 293 ; 260 / ; 260 / ; 428458 ;
Abstract
A heat resistant resin solution comprising (1) at least one solvent selected from the group consisting of alcohols, polyhydric alcohols, polyhydric alcohol derivatives, ketones, ethers and esters, (2) aqueous ammonia and (3) a polymer having a residual acid value of about 5 to 40% obtained by reaction of a 1,2,3,4-butanetetracarboxylic acid, an aromatic tricarboxylic acid anhydride and a diamine in the presence of a polyhydric alcohol and a method of preparation of the heat resistant resin solution.