Optical communications system
CA 2098094 C · Owner: Ainslie, Benjamin James · Inventors: Ainslie, Benjamin James; Finegan, Timothy; Wilkinson, Iain John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical telecommunications system suitable for operation as a wavelength division multiplex which system contains at, least one filter for attenuating signals at wavelength which are unwanted at the location of the filter characterised in that the filter, comprises an optical fibre which contains a dopant adapted to absorb the unwanted signals. An optical telecommunications system suitable for operation as a wavelength division multiplex which system contains at, least one filter for attenuating signals at wavelength which are unwanted at the location of the filter characterised in that the filter, comprises an optical fibre which contains a dopant adapted to absorb the unwanted signals.
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 11, 1991 and granted July 28, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 11, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 11, 2013.
- 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.