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. 16, 1993
Filed:
Nov. 05, 1990
Applicant:
Inventors:
Assignees:
Hitachi, Ltd., Tokyo, JP;
Hitachi Chemical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528353 ;
Abstract
Polyimides represented by general formula (I), (wherein Ar.sub.1 and Ar.sub.2 each represents an aromatic ring-containing group, Cf represents a fluorinated alkyl group directly bonded to Ar.sub.1, and m.gtoreq.1), and polyamide acids as their percursors. The polyimides have excellent humidity resistance and heat resistance, thus being useful as coating materials for semiconductor chips and insulating films for multi-layered wiring. ##STR1##