Optical switch
CA 2044669 C · Owner: Alcatel N.V. · Inventors: Bottle, Dietrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Known are electric switches (multiplexers demultiplexers, data switches) by which two or more data streams are combined or separated or by which combined data streams are switched. For optical signal transmission comparable switches are to be provided. By space- and wavelength-division multiplexing storage problems can be largely avoided. Instead of buffering as in time-division multiplexing, wavelength conversion are performed.
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 June 14, 1991 and granted July 14, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 14, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 14, 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.