Retardation layer having a dispersion adapted to the active liquid-crystalline cell
CA 2172973 A1 · Owner: Mohlmann, Gustaaf Ronald · Inventors: Venema, Jan Willem; Picken, Stephen James; Mohlmann, Gustaaf Ronald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is in the field of retardation layers comprising high-molecular weight liquid-crystalline material for liquid-crystalline displays. The invention is directed to a retardation layer for a liquid-crystalline display comprising high-molecular weight liquid-crystalline material, wherein the dispersion has been adapted to that of the active liquid-crystalline cell by varying the mesogenic groups of the high-molecular weight liquid-crystalline material so that the difference in dispersion between the active cell and the retardation layer in the wavelength area of 400-800 nm is not more than 0.1.
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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 September 29, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 29, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 29, 2016.
- 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.