Optical switching devices
CA 1285643 C · Owner: Kashyap, Raman · Inventors: Kashyap, Raman; Winter, Christopher Simon
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical switch eg. a blocking switch or a coupler, switch has a liquid crystal control element which in at, least one of its control configurations has a splayed, molecular orientation. In a preferred embodiment the liquid crystal is surrounded by chemical control surfaces eg. by homeotropically coated control surfaces.
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
- Granted July 2, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 2, 2008.
- 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.