Bidirectional transmission system, particularly of the optical fibre type, using a single carrier for both transmission directions
CA 2079764 C · Owner: Gautheron, Olivier · Inventors: Gautheron, Olivier; Perrier, Philippe
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This system for two-way transmission, specifically through optical fibre between a terminal called the source terminal and a terminal called the user terminal with a single carrier wave for both transmission directions emitted by a source located in the source terminal comprises, for each direction of transmission means of modulating one of the parameters of said carrier wave this parameter being different for both these directions with an exception in the case of intensity where it may be the same and with in all cases the condition that if the modulation first applied i.e. for the transmission from the source terminal to the user terminal is an intensity modulation, it is applied with a …
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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 October 2, 1992 and granted May 12, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 2, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 2, 2014.
- 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.