Liquid crystals with (polysila) alkyl wing groups
CA 2084562 A1 · Owner: Zahn, Ingo · Inventors: Haeberle, Norman; Krueger, Benno; Zahn, Ingo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, A compound of the general formula M-(CH2)n-(O)m--D-B-q-Y, (I), in which M represents a silicon radical having 2 to 5 silicon atoms which are linked together by bridging elements A and the, remaining valencies of the silicon atoms are saturated with radicals R; A is a bridging element selected from the group consisting of C1- to C8-alkylene radicals and oxygen with the proviso that at least one radical A per M radical is a C1-to C8alkylene radical; R represents optionally fluorine or chlorine atom- or cyano group-substituted straight-chain C1- to C10-alkyl or C2- to C10-alkenyl radicals, branched chain C3- to C10-alkyl or C3- to C10-alkenyl radicals, optionally …
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 December 4, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 4, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 4, 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.