Vinyl compounds, and a liquid-crystalline medium
CA 2088771 A1 · Owner: Pauluth, Detlef · Inventors: Poetsch, Eike; Reiffenrath, Volker; Pauluth, Detlef
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, Vinyl compounds of the formula I in which, R is H, an alkyl or alkenyl radical having 1 to 15 carbon atoms which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen it also being possible for one or more CH2 groups in these radicals to be replaced, in each case independently of one another, by -O-, -S-, , -CO- -CO-O-, -O-CO- or -O-CO-O- in such a manner that oxygen atoms are not linked directly to one another A1 and A2 are each, independently of one another a, (a) trans-1,4-cyclohexylene radical in which in, addition, one or more non-adjacent CH2 groups may be replaced by -O- and/or -S-, (b) 1,4-phenylene radical in which in addition, one or two …
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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 May 26, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 26, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 26, 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.