Waveguide type liquid-crystal optical switch
CA 2418593 A1 · Owner: Kawamoto, Shinji · Inventors: Kawamoto, Shinji; Nakama, Kenichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A waveguide type liquid-crystal optical switch including: an optical waveguide having a pair of first and second cores close to each other for switching an optical path between the pair of first and second cores; a third core made of nematic liquid crystal enclosed in between a pair of oriented films and oriented in a predetermined direction by the pair of oriented films, the third core being disposed in any one of a space covering the first and second cores in parallel with a plane containing optical axes of the first and second cores a space sandwiched, between the first and second cores and a space covering upper surfaces of the first and second cores so as to be laid over the first and …
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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 February 10, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 10, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 10, 2025.
- 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.