Subscriber-concentrated communication system
CA 1289282 C · Owner: Otsu, Toshio · Inventors: Otsu, Toshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A subscriber-concentrated transmission system for interconnecting an exchange and a plurality of subscriber terminals over a concentrated transmission path. A central station receives a call originated while all the communication channels are busy for a terminal for which the call is meant and then, stores for a moment a message which is sent from a calling subscriber. When any of the communication channels becomes idle, the central station transmits the message being stored to a called subscriber over the idle channel.
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
- Granted September 17, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 17, 2008.
- 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.