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. 05, 1993
Filed:
Oct. 18, 1991
Applicant:
Inventors:
Hiroyuki Kusukawa, Tokyo, JP;
Yasuhide Nakajima, Tokyo, JP;
Assignee:
Dai Nippon Printing Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
359891 ; 359885 ; 359 68 ; 252582 ; 430-7 ; 358 64 ;
Abstract
The color filter according to the present invention contains black matrix formed by polyimide, which contains light shielding pigments such as carbon black, triiron tetraoxide, etc. instead of the black matrix used in the past, which is formed by metal thin film such as chromium on glass substrate. Epoxy type silane coupling agent is mixed with polyimide precursor composition, and this is coated on a glass substrate and then imidized. Thus, the color filter is provided with black matrix having high bonding strength with glass substrate.