Optical-fibre telecommunications line with protection device for optical amplifiers
CA 2062665 C · Owner: Pirelli Cavi S.P.A. · Inventors: Righetti, Aldo; Grasso, Giorgio; Tamburello, Mario
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In an optical-fibre telecommunications line comprising two terminal stations, each having an optical-signal transmitter and a receiver operationally connected by an automatic protection device suitable for shutting down said transmitter in the absence of a received optical signal and respective, optical-fibre lines connecting the transmitter of one station to the receiver of the other station and including at least one optical amplifier, at least one of said optical amplifiers is provided with a protection device comprising means for the detection of the presence of an optical signal at the output from the amplifier, operationally associated with means for interrupting the emission of light …
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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 March 11, 1992 and granted May 2, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 11, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 11, 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.