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:
Jun. 23, 1992
Filed:
Aug. 28, 1989
Takayuki Higashii, Kishiwada, JP;
Isao Kurimoto, Toyonaka, JP;
Shoji Toda, Takarazuka, JP;
Masayoshi Minai, Moriyama, JP;
Takeshi Tani, Tsukuba, JP;
Chizu Kawakami, Tsukuba, JP;
Koichi Fujisawa, Tsukuba, JP;
Kiyoshi Imamura, Toyonaka, JP;
Sumitomo Chemical Company, Limited, Osaka, JP;
Abstract
Disclosed are herein optically active ester derivatives represented by the formula (I): ##STR1## (wherein R.sub.1 represents an alkyl group having 3 to 20 carbon atoms; R.sub.2 represents an optically active alkyl or alkoxyalkyl group having 3 to 15 carbon atoms optionally substituted by halogen atoms; Y represents --O--, --COO-- or --OCO--; X represents --COO-- or --OCO--; l represents a number of 1 or 2; k and m each represents a number of 0 or 1; n represents a number of 1 to 6), preparation processes therefor, liquid crystal materials containing such ester derivatives as active ingredient, and a light switching element using said liquid crystal materials as liquid crystal element.