Liquid crystal composition, liquid crystal element and process for the preparation of liquid crystal element
CA 2070541 C · Owner: Nishiyama, Shinichi · Inventors: Nishiyama, Shinichi; Hama, Hideo; Miyachi, Yukio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The liquid crystal composition of the present invention comprises 1 - 99 wt.% of an antiferroelectric liquid crystal compound such as a compound represented by the following formula A-8 and 99 - 1 wt.% of a cholesteric liquid crystal compound such as a compound represented by the following formula B-2. (see formula I), (see formula II) By the use of the liquid crystal composition of the invention, a liquid crystal element improved in liquid crystal properties such as contrast can be prepared.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed June 5, 1992 and granted March 7, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 5, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 5, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.