Terminal adapter pooling system
CA 2045019 C · Owner: Aoki, Takashi · Inventors: Aoki, Takashi; Yamazaki, Yuichi; Sano, Yoshikazu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a key telephone system in which a plurality of data terminals 371 ... 37n such as personal computers are connected to a key service unit 1 connected to a plurality of ISDNs 231 ... 23m, a terminal adapter (TA) 41 is pooled so as to be usable in common for the plural data terminals 371 ... 37n. In response to a setup signal from an ISDN (e.g. 231), the key service unit 1 selects a single data terminal designated by a subaddress included in the setup signal from among the data terminals 371 ... 37n, and closes a communication channel between the selected data terminal (e.g. 371) and the TA 41, so that a status equivalent to that where the selected data terminal 371 and the TA 41 are …
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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 June 19, 1991 and granted June 4, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 19, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 19, 2013.
- 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.