Compounds for use in liquid-crystal mixtures
CA 2082304 A1 · Owner: Kaltbeitzel, Anke · Inventors: Kaltbeitzel, Anke; Schlosser, Hubert; Illian, Gerd
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the disclosure Novel compounds fox use in liquid-crystal mixtures Compounds of the formula (I), R1-(A1)a(-M1)b-(-A2)c(-M2)d(-A3)e(-M3)f(-A4)g-H (I) in which the symbols and indices have the following meanings:, R1 is H or a straight-chain or branched alkyl radical having 1 to 22 carbon atoms (with or without an asymmetrical carbon atom) in which, in addition it, is possible for one or two non-adjacent -CH2- groups to be replaced by -O-, -S-, -CO-, -CO-O- -O-CO-, -CO-S-, -S-CO-, -O-CO-O-, -CH=CH- -C=C-, .DELTA. or, -Si(CH3)2-, and in which in addition, one or more, hydrogen atoms of the alkyl radical may be substituted by F, Cl, Br or CN, or is a chiral group, for example an …
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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 November 6, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 6, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 6, 2014.
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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.