Connection control method for personal communications
CA 2107982 C · Owner: Hirata, Shoichi · Inventors: Yabusaki, Masami; Takemoto, Eriko; Nakajima, Akihisa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a connection control method for personal communications. In accordance with the present invention a switching center which is comprised of a first memory part a second memory part and a, third memory part. The first memory part stores a terminating terminal number which corresponds to each subscriber. The terminating terminal number is registered by each subscriber. The second memory part stores idle/busy information corresponding to each terminal. The third memory part stores idle/busy information corresponding to each subscriber. When a subscriber makes a call at a terminal, the switching center determines whether the idle/busy information for 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 October 7, 1993 and granted March 30, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 7, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 7, 2015.
- 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.