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:
Aug. 06, 1991
Filed:
Feb. 02, 1989
Applicant:
Inventors:
Assignee:
Nippon Oil Company, Limited, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02F / ;
U.S. Cl.
CPC ...
3591 / ; 2522997 ; 25229901 ;
Abstract
An optical filter consisting essentially of a glutamate copolymer having thermotropic cholesteric liquid crystal properties and represented by the general formula: ##STR1## wherein R.sub.1 is an alkyl group, a cycloalkyl group, an aryl group or an arylalkyl group having 10 or less carbon atoms, and R.sub.2 an alkyl group, a cycloalkyl group, an aryl group or an arylalkyl group having 6 to 30 carbon atoms, provided that R.sub.1 and R.sub.2 are different from each other; m and n are numbers satisfying the following relationships 50.ltoreq.m+n.ltoreq.2000 and m/n=80 to 10/20 to 90.