Add/drop optical multiplexing device
CA 2310586 A1 · Owner: Grasis, Michael E. · Inventors: Scobey, Michael A.; Lafreniere, Robert W.; Grasis, Michael E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical device has a filter assembly defining a light path preferably a , multi-bounce zigzag expanded beam light path from a common port (36) at least , to a first channel port (38) and then a second channel port (40) and then a pass-through port (32). The first channel port (38) has a first optical filter element (48), which is transparent to a wavelength sub-range within the wavelength range passed by the common port (36) and the pass-through port (32), and substantially reflective of other wavelengths within such wavelength range. The second channel port (40) includes a second optical filter element (60) having light transmittance and reflectance properties substantially the …
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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 December 10, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 10, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 10, 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.