e are each independently 0 or 1; R3 is an alkyl group having 1 to 15 carbon...http://www.google.com.au/patents/US4973425?utm_source=gb-gplus-sharePatent US4973425 - Liquid crystal composition and use thereofAdvanced Patent SearchPublication numberUS4973425 APublication typeGrantApplication numberUS 07/398,264Publication date27 Nov 1990Filing date24 Aug 1989Priority date25 Aug 1988Fee statusPaidAl