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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.:

US 4921632 B1

PDFFull Text
Date of Patent:
May. 01, 1990

Filed:

Aug. 19, 1988

Liquid crystal compounds and compositions

Applicant:
Inventors:

Toyokazu Nakamura, Tokyo, JP;

Yuzi Kato, Tokyo, JP;

Shohei Naemura, Tokyo, JP;

Chizuka Tani, Tokyo, JP;

Masahiro Satoh, Kyoto, JP;

Kunikiyo Yoshio, Ohmihachiman, JP;

Hiroshi Kishiki, Takatsuki, JP;

Hiroshi Hoshino, Hirakata, JP;

Assignees:

NEC Corporation, Tokyo, JP;

Sanyo Chemical Industries, Ltd., Kyoto, JP;

Attorney:

Armstrong, Nikaido, Marmelstein, Kubovcik & Murray

Primary Examiner:

Teddy S Gron

Int. Cl.
CPC ...
C09K / ; C09K / ; C09K / ; C09K / ; C09K / ; C09K / ; C09F / ; C09F / ;
U.S. Cl.
CPC ...
2522991 ; 25229901 ; 2522996 ; 25229961 ; 25229962 ; 25229963 ; 25229964 ; 25229965 ; 25229966 ; 25229967 ; 25229968 ; 3503 / ; 3503 / ; 534577 ; 544229 ; 544238 ; 544239 ; 544240 ; 544241 ; 544295 ; 544296 ; 544298 ; 544315 ; 544316 ; 544318 ; 544322 ; 544330 ; 544331 ; 544332 ; 544333 ; 544334 ; 544335 ; 544357 ; 544406 ; 544409 ; 544408 ; 544336 ; 558384 ; 558412 ; 558416 ; 558271 ; 558272 ; 558273 ; 558275 ; 558276 ; 558288 ; 558290 ; 560-9 ; 560 10 ; 560 18 ; 560 17 ; 560 21 ; 560 22 ; 560 23 ; 560 20 ; 560 35 ; 560 59 ; 560 61 ; 560 62 ; 560 64 ; 560 73 ; 560 65 ; 560 55 ; 560-8 ; 560100 ; 560102 ;
Abstract

Liquid Crystal compounds represented by the following formula are disclosed. ##STR1## wherein R and R' are independently selected from alkyl groups containing 1.about.20 carbon atoms; X is --O--, --O--CO--O-- or direct bond; A.sub.1 and A.sub.2 are independently cyclic groups (such as phenylene and biphenylene), said cyclic groups may be substituted with 1.about.4 fluorine, chlorine or bromine atoms, or 1 or 2 substituent groups selected from the group consisting of cyano, nitro and trifluoromethyl groups; Y is --CO--O--, --O--CO--, --C.tbd.C--, --CH.sub.2 O--, --OCH.sub.2 --, --CH.dbd.N--, --N.dbd.CH--, --N.dbd.N--, --CH.sub.2 S--, --SCH.sub.2 -- or direct bond; and * represents asymmetric atom providing optical activity.

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