Liquid crystal thiol compounds
CA 2064875 A1 · Owner: Qinetiq Limited · Inventors: Jenner, John Anthony; Toyne, Kenneth Johnson; Mcdonnell, Damien Gerard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of formula (I) where R is C1-15 alkyl X is hydrogen, fluorine or chlorine, m and n are independently selected 1 or 0 W is C1-15 alkyl or alkoxy, CN or halogen rings A and B are, independently selected from phenyl laterally fluoro- or chloro-, substituted phenyl transcyclohexyl, pyridyl, pyrimidyl or dioxanyl. Preferred embodiments have R=C3-8 and where W is alkyl or, alkoxy then it is also preferable that W=C3-8. Where m=0 then, preferably W=CN, and where m=1, then preferably W=alkyl.
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 11, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 11, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 11, 2013.
- 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.