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. 08, 2008
Filed:
Jan. 27, 2003
Stephen M Kelly, Hull, GB;
Warren L Duffy, Chilworth, GB;
Neil L Campbell, Bangor, GB;
QinetiQ Limited, London, GB;
Abstract
A compound of formula (I): where Ris alkyl or alkenyl, Yand Yare independently selected from oxygen or sulphur, n is an integer of from 1 to 5, A is an optionally substituted phenyl or an optionally substituted cycloalkyl ring, X is a direct bond, a Calkylene, a Calkenylene, an acetylene, —CO(O)— or a group of sub-formula (i): where Xand Xare independently selected from a direct bond, a Calkylene, a Calkenylene, an acetylene, —CO(O)— and R, Rand Rare independently selected from hydrogen, halo or cyano, provided that no more than one of R, Rand Ris hydrogen. These compounds have a high dipole moment and may be used as dopants in liquid crystal mixtures.