Multimedia private branch exchanger and private branch exchange system
CA 2367097 C · Owner: Toshiba Communication Technology Corporation · Inventors: Funato, Yasuo; Asada, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A private branch exchange system, comprising an exchanger operable to connect a plurality of extension lines and at least one office line and having various functions concerning exchange between the extension lines or between the extension lines and the office line and a, computer for carrying out part of the functions of the exchanger. The computer comprises means for monitoring abnormality in said computer, and means for informing the exchanger of abnormality monitor results obtained by the abnormality monitoring means. The exchanger comprises means for receiving the abnormality monitor results from the computer, means for discriminating abnormality on the basis of the abnormality monitor …
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 December 30, 1998 and granted December 10, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 30, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 30, 2020.
- 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.