Use of macrocyclic compounds as component for ferroelectric liquid crystal mixtures
CA 2040268 A1 · Owner: Rosch, Norbert · Inventors: Rosch, Norbert; Harada, Takamasa; Wegener, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, Use of macrocyclic compounds as component for ferroelectric liquid crystal mixtures, A liquid crystal mixture composed of at least two components containing as one component a macrocyclic compound of the general formula (1), (1), in which a, b, c, d, e, f, independently of one another are, an integer from zero to 4, a + b + c + d + e being greater than 7, and, -A-, -B-, -C-, -D-, -E-, -Fidentical or different, are, for example -CH2-, -CH=CH-, -CO- or -COO-, leads in FLC displays to the formation of a uniform alignment and avoids twist states, which is reflected in a significantly improved contrast.
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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 April 11, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 11, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 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
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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.