Switching system with both-way line managing system
CA 2012319 C · Owner: Higuchi, Mamoru · Inventors: Kaneko, Yoshihiro; Higuchi, Mamoru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a switching system having a both-way line connected between a primary office and an opposite for communicating through a selected one of the both way lines, and having control unit for selecting one of the both-way lines to be used for communication. To reduce double hunting of a both-way line, the control means comprises an outgoing connection process controlling unit for detecting a release of a both-way line activated by said primary office; an incoming connection process controlling unit for detecting a release of a both-way line activated by said opposite office; and a both-way line managing unit for deciding the priorities for selection of a plurality of both-way lines. …
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 March 15, 1990 and granted February 15, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 15, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 15, 2012.
- 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.