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:
Dec. 01, 1992
Filed:
Jun. 08, 1989
Lawrence K Chan, Hull, North Humberside HU8 8NN, GB;
David Coates, Bishop's Stortford, Hertfordshire CM23 5EY, GB;
Peter A Gemmell, Runcorn, Cheshire WA7 2UH, GB;
George W Gray, Cottingham, North Humberside HU8 9NW, GB;
David Lacey, Hull, North Humberside HU8 9NM, GB;
Kenneth J Toyne, Hull, North Humberside HU68QW, GB;
Daniel J Young, Conisborough, Yorkshire Dn12 3BG, GB;
Other;
Abstract
Compounds which may be used as a dopant or host in a ferroelectric chiral smectic liquid crystal mixture. The compounds are characterized in that they are derivates of an X-hydroxy carboxylic acid and contain the chiral unit (I), in which Ro may be alkyl, alkoxy, halogen, formula (II), where b may be 0 to 3 and the phenyl ring may be substituted, and a is 0 or 1. The chiral unit is combined with a range of mesogenic combinations of groups. Lactic acid derivatives are described in detail (i.e. Ro.dbd.methyl) together with various preparative routes, for example the compound formula (III), which has dopant properties in a range of hosts.