Method for releasing unnecessary trunks from a telephone call
CA 2127005 C · Owner: Hirsohn, Paul · Inventors: Dayner, David; Lacker, Virginia; Hirsohn, Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for recognizing and releasing unnecessary trunk lines in a private branch exchange, telephone system including a plurality of switching nodes each having a , unique node identification number whore each pair of nodes is connected by a plurality of trunk lines includes steps for (a), compiling a telephone call identifier list containing node identification numbers and an associated, trunk call identification number used in defining and connecting a call path between a calling party, and a called party (b) examining a call identifier list at each of the switching nodes for information, indicative of redundant node identification numbers and (c) releasing the , unnecessary trunk …
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 June 29, 1994 and granted November 4, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 29, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 29, 2016.
- 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.