Difluorooxymethane derivative and liquid crystal composition
CA 2202349 C · Owner: Miyazawa, Kazutoshi · Inventors: Goto, Yasuyuki; Haseba, Yasuhiro; Nakagawa, Etsuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In order to provide novel compounds which are useful as liquid crystal materials for low voltages in several liquid crystal displays, have a large dielectric anisotropy and are, low in viscosity; and to improve characteristics of liquid crystal compositions, difluorooxymethane derivatives expressed by the following general formula (I) and liquid crystal compositions containing the compound are proposed (see formula I), wherein each of ~, m, and n is 0 or 1 rings A1 to A3, independently represent six-membered rings such as trans-2,4cyclohexylene and 1,4-phenylene, Z1 to Z3 independently represent a bonding group such as covalent bond and -CH2CH2- L1 to L4, independently represent.hydrogen …
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 October 13, 1995 and granted January 7, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 13, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 13, 2017.
- 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.