Wide-area wireless distribution system
CA 2257967 C · Owner: Nortel Networks Limited · Inventors: Graves, David H.; Schellenberg, James; Bugas, Dmitry
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A low power, multi-cellular, broadband communication system for the unidirectional (i.e. broadcast), bi-directional and multi-directional transmission and reception of voice, video audio, television and data signals , is provided within the context of a point to multipoint network topology. The system incorporates modem, modulator and demodulator elements that operate over the complete licensed band of the operator. In addition the microwave , transmitter, receiver and transceiver elements also operate over the licensed band of the operator, thereby achieving a broadband microwave infrastructure coupled with a flexible modem (modulator demodulator) architecture that , allows flexible …
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 13, 1997 and granted December 31, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 13, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 13, 2019.
- 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.