Wave guide with channel for optical substrate
CA 2431797 C · Owner: Escoubas, Ludovic · Inventors: Drouard, Emmanuel; Escoubas, Ludovic; Torregrossa, Frank
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a waveguide comprising a channel (12) on an optical substrate (11) the refractive index of said channel being higher than that of the substrate. Said waveguide comprises at least a guide layer (13) provided on the channel the index of said guide layer being higher than that of the substrate. In addition the channel (12) is integrated in the substrate (11). Advantageously the guide further comprises a covering layer (14) arranged on the guide layer (13) the index of said covering layer being less than that of the guide layer and that of the channel. The invention also concerns a method for making said waveguide.
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 December 14, 2001 and granted June 14, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 14, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 14, 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
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.