Optical wavelength division multiplexer/ demultiplexer device
CA 2518072 C · Owner: Qinetiq Limited · Inventors: Jenkins, Richard Michael; Mcnie, Mark Edward
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical wavelength division multiplexer/demultiplexer device (2) is described that comprises a substrate (6) having a plurality of wavelength selecting filters (26, 28, 30, 32, 34, 36). The filters (26 28, 30, 32 ,34 ,36) are arranged to provide conversion between a combined beam comprising a plurality of wavelength channels and a plurality of separate beams each comprising a subset of said plurality of wavelength channels. Hollow core waveguides (4) are formed in said substrate to guide light between the wavelength selecting filters. An add/drop multiplexer (100) is also described.
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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 March 17, 2004 and granted December 4, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 17, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 17, 2026.
- 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.