Ferroelectric liquid crystal tunable filters and color generation
CA 2071870 A1 · Owner: Sharp, Gary D. · Inventors: Sharp, Gary D.; Johnson, Kristina M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Discretely and continuously tunable filters and high contrast light valves employing FLC cells are provided. Discretely tunable filters employ bistable smetic C* FLC cells (LC1 LC2, LC4-LC7). Continuously tunable filters employ smetic A* FLC cells (C C2, C3, C4). Single or multiple stage filters are provided. Blocking filters useful for color generation are also provided. The FLC filters provided can be temporally multiplexed.
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 30, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 30, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 30, 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.