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:
Jul. 07, 1992
Filed:
Aug. 14, 1990
Applicant:
Inventor:
Ying-yen Hsu, Los Altos, CA (US);
Assignee:
Optical Shields, Inc., Menlo Park, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09K / ; C09K / ; C07D / ; G02F / ;
U.S. Cl.
CPC ...
25229961 ; 25229901 ; 544298 ; 544315 ; 544316 ; 544318 ; 359104 ;
Abstract
Substituted-hydrocarbylthio phenyl-pyrimidines are disclosed which exhibit smectic A phases over a wide temperature range and are useful in formulating smectic A compositions. The liquid-crystal compositions formulated utilizing the smectic A compounds of the present invention have particular application in smectic cells such as laser smectic liquid-crystal light valves and optical limiters used in high performance environments.