Communications system
CA 2002295 C · Owner: British Telecommunications Public Limited Company · Inventors: Chadney, Anthony Gerard; Motley, Andrew James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A communications system has a base centre with radio transceivers 15 for providing a number of radio frequency (RF) communications links and a plurality of fixed radio ports 1 through which RF signals can be transmitted and received over the air. A fibre optic network (2 4), interconnects the RF transceivers 15 and the fixed radio ports 1, and carrys the RF signals by means of optical signals. There are plurality of radio/optical interfaces by which RF signals can be modulated onto and demodulated from one or more optical signals, between the RF transceivers and the fibre optic network and between the, fibre optic network and the fixed radio ports. A matrix switch 13 selectively …
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 November 6, 1989 and granted May 14, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 6, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 6, 2011.
- 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.