Service node for a telephony network
CA 2195437 C · Owner: Hollywood, Steven · Inventors: Hollywood, Steven; Johnston, John Griffth
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A service node provides a shared added value service within a telephony network, such as a public switch telephone network. Peripheral devices (21 22, 23), such as speech applications platforms shared announcement platforms and message recording platforms, are connected to a switch (25) which operates under the control of a central control computer (24). The switch includes distributed processors (38, 52) responsive to externally originating signals such as DTMF signals, generated while calls are being processed. The distributed processing devices supply information derived from said signals to the central control computer. Thus, it is no longer necessary for a central control …
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 August 1, 1995 and granted July 27, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 1, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 1, 2017.
- 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.