Channel access system
CA 2014489 C · Owner: Fujitsu Limited · Inventors: Nakata, Nobuki; Ishikawa, Minoru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A channel access system comprises n channel parts for receiving m channels of voice signals and for outputting voice frequency data and signaling data and, a multiplexer part for receiving the voice frequency data and the signaling data of the m channels from the n channel parts and for supplying channel access signals to the n channel parts for designating a channel of the voice frequency data, where each of the n channel parts include a coder for coding a corresponding one of the voice signals into one of the voice frequency data a, decoder for decoding the channel access signals and for generating a synchronizing signal which is synchronized to a corresponding one of the channel access …
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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 April 12, 1990 and granted December 7, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 12, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 12, 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.