Carboxylate compounds, liquid crystal compositions containing said compounds and liquid crystal element
CA 2022880 A1 · Owner: Doi, Nobuyuki · Inventors: Miyakoshi, Shoichi; Yamaoka, Hideo; Nishiyama, Shinichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In accordance with the present invention there are, provided carboxylate compounds represented by the following formula A, ... A, I wherein R1 represents one group selected from the group consisting of alkyl group having 6 to 18 carbon atoms alkoxy, group having 6 to 18 carbon atoms and halogenated alkyl group of 6 to 18 carbon atoms, C* represents an asymmetric carbon atoms, and R2 represents a group represented by the following formula B or C, -(CH2)m-CH3 ... B, - (CH2)n-COOR3 ... C wherein m represents an integer of 2 to 6 n represents an, integer of 0 to 5, and R3 represents alkyl group having 1 to 10 carbon atoms or halogenated alkyl group having 1 to 10 carbon atoms. In accordance …
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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 August 8, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 8, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 8, 2012.
- 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.