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:
Sep. 18, 1990
Filed:
Oct. 03, 1988
Applicant:
Inventors:
Tohru Kikuchi, Hitachi, JP;
Toshiyuki Fujita, Hitachi, JP;
Takayuki Saito, Hitachi, JP;
Mitsumasa Kojima, Hitachi, JP;
Hidetaka Sato, Hitachi, JP;
Hiroshi Suzuki, Hitachi, JP;
Assignee:
Hitachi Chemical Company, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528346 ; 428-1 ; 549465 ;
Abstract
A polyimide obtained from a polyamide-acid or polyamide-acid ester prepared by reacting dicyclohexyl-3,4,3', 4'-tetracarboxylic acid or dinanhydride with a diamine is excellent in transparency, heat resistance and mechanical properties, said polyimide being able to be obtained at a lower temperature, and particularly suitable for an orientation film used in a liquid crystal display device.