Planar optical waveguides for optical panel having gradient refractive index core
CA 2405244 A1 · Owner: Veligdan, James T. · Inventors: Veligdan, James T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical panel (10) is disclosed. A plurality of stacked planar optical waveguides (10a) are used to guide light from an inlet face (20) to an outlet face (24) of an optical panel (10). Each of the optical waveguides (10a) comprises a planar sheet of core material having a central plane. The core material has an index of refraction which decreases as the distance from the central plane increases. The decrease in the index of refraction occurs gradually and continuously.
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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 April 5, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 5, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 5, 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.