Mixtures of pyramidal columnar liquid crystals and procedure for their preparation
CA 2031706 A1 · Owner: Bonsignore, Stefanio · Inventors: Cometti, Giuseppe; Bonsignore, Stefanio; Du Vosel, Annick
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mixtures of pyramidal columnar liquid crystals made up of dodeca-substituted derivatives of macrocyclic tetramers wherein each of the substituents is either linear or branched alkanoyl chain of different lengths and randomly distributed. these mixtures show stable mesophases of the columnar type having a wide temperature range which also includes room temperature.
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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 December 6, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 6, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 6, 2012.
- 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.