Television signal distribution network
CA 2136603 C · Owner: Terry, John Brian · Inventors: Anderson, Carl William Craig; Terry, John Brian; Warwick, Alastair Anthony
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cable television network is supplemented with optical fibers and fiber termination units to communicate additional downstream digital signals and upstream, signals. A drop unit for each customer premises is provided in the drop cable. The drop, unit demodulates downstream signals and selects for delivery to the customer premises, only those downstream signals addressed to the customer premises modulating , the, selected signals using binary phase shift keying (BPSK) which provides relative, immunity to noise for forwarding the signals to the customer premises. Upstream BPSK, signals from the customer premises are demodulated and remodulated in the drop unit to, isolate the customer …
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 24, 1994 and granted August 3, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 24, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 24, 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.