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:
Apr. 27, 1993
Filed:
May. 20, 1991
Applicant:
Inventors:
Assignee:
Nippon Oil Company, Limited, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02F / ; C09K / ; C09K / ;
U.S. Cl.
CPC ...
359106 ; 25229901 ; 428-1 ;
Abstract
An optical rotator comprising a light transmitting base, an alignment film layer formed on said base, and a film layer formed of a liquid crystalline polymer. The film layer exhibits a twisted nematic orientation in the state of liquid crystal and assumes a glassy state at a temperature below a liquid crystal transition point of the polymer. The polymer is a polyester which includes an ortho-substituted aromatic unit.