Optical filters
CA 2413650 A1 · Owner: Janssen, Adrian · Inventors: Janssen, Adrian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A multi cavity comb filter for interleaving or de-interleaving WDM signals has a, plurality of stacked optical cavities each having substantially the same thickness. The multiple cavity arrangement provides a comb reflection response and a comb transmission response with broad peaks so that the filter can be used , for, transmitting one group of channels and reflecting another group of channels at interleaved positions. The cavities are preferably formed from silicon wafers so, that existing techniques can be employed to obtain specific cavity thicknesses with sufficient accuracy and uniformity.
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 December 5, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 5, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 5, 2024.
- 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.