Optical branching filter
CA 1278714 C · Owner: Fujitsu Limited · Inventors: Terai, Kiyoshi; Asanuma, Kazushi; Isono, Hideki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical branching filter branches or mixes light of n different wavelengths. A first input/output part for light consisting of the n wavelengths mixed together is provided at one of two surfaces of a transparent block. Various second input/output parts for forming optical filters each allowing only light having a respective predetermined one of the n wavelengths to pass therethrough and reflecting light having other wavelengths, are provided at any one of two surfaces. A first input/output port and n second input/output ports respectively, is formed by an optical waveguide and a lens which optically connects the optical waveguide and first input/output part or a second input/output part. …
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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
- Granted January 8, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 8, 2008.
- 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.