Fast packet and frequency switch
CA 2022503 C · Owner: Cselt - Centro Studi E Laboratori Telecommunicazioni S.P.A. · Inventors: De Bosio, Alfredo; Daniele, Antonella
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fast packet and frequency switch has inputs and outputs connected to optical fibres, each accommodating a number of different wavelength optical carriers modulated, by serial information flows organized into packets. These packets are phase-realigned and their labels are converted by an input block under control of external processors designed to set up and tear down connections. The optical carriers allocated to packets are frequency converted and, the packets are recombined onto a single fibre by a passive recombination network for storage in an optical loop memory formed by an optical fibre delay line. Packets are extracted as their assigned outputs and output carrier frequencies …
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 August 1, 1990 and granted April 28, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 1, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 1, 2012.
- 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.