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. 30, 1999
Filed:
Sep. 19, 1994
Kenneth Johnson Toyne, Humerside, GB;
John William Goodby, Humerside, GB;
Alexander Seed, Humerside, GB;
George William Gray, Dorset, GB;
Damien Gerad McDonnel, Worcestershire, GB;
Edward Peter Raynes, Worcestershire, GB;
Sally Elizabeth Day, Worcestershire, GB;
Kenneth John Harrison, Worcestershire, GB;
Michael Hird, Humberside, GB;
Abstract
##STR1## The invention describes liquid crystalline compounds or formula (I), where A, D and G are independently selected from phenyl, thiophene, hydrogenated phenyl, chlorinated phenyl and fluorinated phenyl, B and E are independently selected from a single bond C.dbd..notident.C. C.tbd.C.C00, azoxy and diazo, k and m are independently selected from 1 and 0, such that m+n is 1 or 2, and R.sub.1 and R.sub.2 are independently selected from R, R0, alkynyl, thioalkyl, hydrogen, CN, NCS and SCN; provided that at least one of R.sub.1 and R.sub.2 is selected from CN, NCS and SCN and that at least one of A, D and G is phenyl; and excluding where at least one of R.sub.1 and R.sub.2 is independently selected as CN and one of A, D or G is not thiophene, and where m is 0, A, and D are phenyl, B is a single bond and only one of R.sub.1 or R.sub.2 is NCS. Also described are compounds suitable for inclusion in a device utilizing pretransitional characteristics of liquid crystalline materials in the isotropic phase, of general formula (II) where J and Y are independently selected from phenyl, thiophene, hydrogenated phenyl, chlorinated phenyl and fluorinated phenyl, X is selected from C.dbd..notident.C. C.tbd.C.COO azoxy and diazo, k is 1 or 0 and R.sub.3 and R.sub.4 are independently selected from R, RO, alkynyl, thioalkyl, hydrogen, CN, NCS and SCN; provided that at least one of R.sub.3 and R.sub.4 is selected from CN, NCS and SCN and that at least one of J and Y is phenyl.