Low-loss waveguide and method of making same
CA 2423076 A1 · Owner: Kimerling, Lionel C. · Inventors: Lee, Kevin K.; Wada, Kazumi; Kimerling, Lionel C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of reducing the scattering losses that involves smoothing of the core/cladding interface and/or change of waveguide geometry in high refractive index difference waveguides. As an example the SOI-based Si/SiO2 waveguides , are subjected to an oxidation reaction at high temperatures after the , waveguide patterning process. By oxidizing the rough silicon core surfaces after the patterning process, the core/cladding interfaces are smoothened reducing the roughness scattering in waveguides.
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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 August 8, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 8, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 8, 2023.
- 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
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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.