Optical coupler and/or multiplexer
CA 2287416 A1 · Owner: Dong, Liang · Inventors: Dong, Liang; Laming, Richard Ian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical fibre coupler has at least an m-core optical fibre (100) optically coupled to an n-core optical fibre (110) where m and n are positive integers , and m is greater than 1. A channel add/drop multiplexer comprises such an optical fibre coupler and a Bragg grating (130) disposed on the m-core fibre outside the coupling region (120).
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 April 20, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 20, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 20, 2020.
- 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.