Color filters, their production process, color liquid crystal panels and method of driving the panels
CA 2276194 A1 · Owner: Idemitsu Kosan Company Limited · Inventors: Kurata, Hideaki; Yokoyama, Seiichirou
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A liquid crystal display consists of a liquid crystal encapsulated with a color, filter. The color filter comprises a metal black matrix an insulating film, a , transparent, electrode and a coloring matter layer laminated in that order, on one side of an insulating, substrate. The transparent electrode is used as an electrode for driving the liquid crystal.
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 August 30, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 30, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 30, 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
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.