Polycrystalline ferroelectric optical devices
CA 2376940 A1 · Owner: Hwang, Harold Yoonsung · Inventors: Siegert, Markus J.P.; Hwang, Harold Yoonsung
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical device comprises a body of ferroelectric material exhibiting an effective electro-optic coefficient (r eff) and an optical loss (.alpha.) with the body being, adapted for the propagation of optical radiation at a wavelength .lambda.o through it, and means, for applying an electric field to the body in order to alter the refractive index therein, characterized in that the body is polycrystalline and has an average grain size such that, r eff is relatively high and .alpha. is relatively low both at .lambda.o In a , preferred embodiment the body has an average grain size that is less than about .lambda.o /10 preferably in the range of, approximately 8-20 nm which is especially …
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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 March 15, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 15, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 15, 2024.
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Timeline
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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.