Digital pb exchanger with multi-processor control system using asynchronous transfer mode
CA 2177781 C · Owner: Honma, Yoshio · Inventors: Honma, Yoshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a Digital PB exchanger with a Multi-processor control system by using an ATM for a plurality of Digital PB exchangers with a single processor control system to multiplex PCM voice data and communication data between processors. The Digital PB exchanger consists of a Processor unit a Time division switch, a subscriber circuit a trunk, circuit, a telephone terminal and the like. A PCM voice signal and data from the Time division switch 21 are connected to the ATM switch 5 via the ATM interface circuit 31 so that communication of the audio signal can be made possible. Furthermore, when data is transmitted from one processor to another processor the data from 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 May 30, 1996 and granted November 20, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 30, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 30, 2018.
- 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.