Programmable call progress tones for a switching system
CA 2068154 C · Owner: Mitel Corporation · Inventors: Halligan, Janice C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In accordance with an embodiment of the invention, a method of establishing call progress tones for a switching system having generic signal generating apparatus is comprised of the steps of displaying at least one form on a display and inserting into fields of the form definitions of the cadencing and particular generic signals associated with each call progress tone for a tone plan, temporarily storing the definitions in a memory compiling the definitions as control signals into object code, storing the object code in a random access memory, and using the object code in the processing of a call by a switching system processor to control provision of particular signals from the generic …
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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 May 7, 1992 and granted January 14, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 7, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 7, 2014.
- 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.