Improvements in or relating to optical switching
CA 2348368 A1 · Owner: Mansbridge, John · Inventors: Mansbridge, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Described herein is an integrated optical device (400) having an input path (402) and an output path (420). A waveguide (430) including a Bragg grating is located in the output path (42). A plurality of control elements are located, along the waveguide (430) for providing local adjustment of the Bragg grating to compensate for manufacturing errors. The control elements are conveniently thermo-optic elements, for example resistive elements whose, temperature can be changed by supplying current to them.
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 May 22, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 22, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 22, 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.