Composite concentration system
CA 1185711 A · Owner: Nippon Electric Co. Ltd. · Inventors: Yasui, Tadahiko; Usami, Takashi; Yamada, Hajime
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a composite concentration system of the type utilizing a time division system in which voice signals are digitallized and than concentrated in a traffic there, are provided a first subscriber line interface circuit means of a first type which connects subscriber's lines directly to subscriber line interface circuits a second, subscriber line interface circuit means of a second type which connects subscriber lines to subscriber line interface circuits via a space division concentration switch and a time division concentration switch connected to the first and second subscriber line interface circuit means via switching interfaces. The number of output terminals of the first subscriber …
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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
- Granted April 16, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 16, 2002.
- 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.