Method of telephone signalling via data link
CA 2110643 C · Owner: Price, Mark J. · Inventors: Pinard, Deborah L.; Price, Mark J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a method of processing calls in a telephone switching system which is comprised of voice trunks and a message signalling link for carrying signalling data relating to calls on the voice trunks, and a processor for controlling the switching system, comprised of receiving an incoming signalling message on the signalling link converting, the message into signalling messages of a type recognizeable by the processor as received from a voice trunk, and including a signalling trunk identification address, looking up in a table, a correspondence between the signalling trunk identification address and a voice trunk identification address, passing the messages with …
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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 December 3, 1993 and granted July 8, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 3, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 3, 2015.
- 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.