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. 21, 1989
Filed:
May. 18, 1988
Applicant:
Inventors:
Yasuyuki Tanaka, Tokyo, JP;
Haruyoshi Takatsu, Tokyo, JP;
Kiyohumi Takeuchi, Tokyo, JP;
Yuji Tamura, Saitama, JP;
Assignee:
Dainippon Ink and Chemicals, Inc., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C02F / ; C09K / ; C07C / ;
U.S. Cl.
CPC ...
570129 ; 2522295 ; 25229963 ; 3503 / ; 3503 / ;
Abstract
A tetracyclic nematic liquid crystal compound of the following formula: ##STR1## wherein R represents a straight-chained alkyl group carrying one to seven carbon atoms; and ##STR2## has a trans (equatorial-equatorial) configuration; is disclosed. This compound has a high N-I transition temperature and a low S-N transition temperature and is highly useful as an electro-optical display material.