Device for extraction and re-insertion of an optical carrier in optical communication networks
CA 2129779 C · Owner: Otc - Optical Technologies Center S.R.L. · Inventors: Vezzoni, Emilio; Calvani, Riccardo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device for extraction and reinsertion of an optical carrier in an optical communication network includes a first optical circulator connected in series with the line in order to receive a signal stream including a carrier to be extracted, modulated by an information signal and to transmit a signal stream, including the same carrier re-inserted into the stream after having being modulated with another information signal and a second optical circulator, connected to local information processing apparatus to which it supplies the, extracted carrier and from which it receives the carrier to be re-inserted. Between the two circulators there is an optical fibre bandpass filter that can be tuned …
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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 August 9, 1994 and granted February 16, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 9, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 9, 2016.
- 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.