Liquid crystal display device and preparation thereof
CA 2061696 A1 · Owner: Kashiwagi, Tohru · Inventors: Kajiyama, Tisato; Kashiwagi, Tohru; Hara, Koji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A liquid crystal display device has a pair of transparent electrodes and a composite film having continuous pores of a polymer matrix filled with a liquid crystal material. The polymer matrix is made of (a) a cross-linked material prepared through an addition reaction of a carboxyl groupcontaining acrylonitrile/butadiene copolymer with an oxazoline compound, or (b) a polyimide resin. The resulting device has improved light transmittance contrast, and improved resistance to having its contrast characteristics impaired by heat.
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 February 24, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 24, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 24, 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.