Communication terminal connection system
CA 2009556 C · Owner: Matsumoto, Takashi · Inventors: Matsumoto, Takashi; Uehara, Takeshi; Motohashi, Kazutoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A communication terminal connection system couples at least one of terminals to a destination terminal via a line, and comprises a channel switch connected to the terminals, at least one multiplexer coupled to the channel switch which is coupled between the terminals and the multiplexer, and a control part coupled to the channel switch for switching and controlling a connection of the channel switch. The control part includes a first detection part for detecting a request-to-use information which is received from a source terminal and requests use of the multiplexer, a second detection part for detecting an identification number to which the multiplexer is coupled via the line when the …
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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 February 8, 1990 and granted January 11, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 8, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 8, 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.