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:
Nov. 17, 1998
Filed:
Jul. 24, 1996
Applicant:
Inventors:
Chiaki Yamagishi, Hitachi, JP;
Nori Sasaki, Hitachi, JP;
Shigeo Nara, Mito, JP;
Hidetaka Sato, Hitachi, JP;
Shigeru Hayashida, Hitachi, JP;
Masato Taya, Hitachi, JP;
Assignee:
Hitachi Chemical Company, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ; G02B / ;
U.S. Cl.
CPC ...
528353 ; 528170 ; 528322 ; 528310 ; 4284735 ; 26433119 ; 4273855 ; 385129 ; 385143 ; 385144 ; 385145 ; 385146 ;
Abstract
Polyimides satisfying the requirements (a), (b) and (c) among the requirements described below, polyimides satisfying the requirements (b), (c) and (d), and polyimides satisfying the requirements (a), (b), (c) and (d) are excellent in transparency, isotropy and resistance to cracking (no crack is formed in the formation of a multilayer film, so that the multilayer formation is easy, namely, the polyimides are good in processability) and can give optical parts excellent in optical characteristics: