Telecommunications networks
CA 2243856 C · Owner: Hoy, Michael Davey · Inventors: Curtis, Stephen John; Hoy, Michael Davey
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a telecommunications network, testing of pre-ringing signalling at customer's premises (3), for example, signalling to activate a caller display unit (15), may be effected remotely. By establishing a test call through the network by way of a dial-back loop (8) to a test telephone number (11) establishing a second call through the network to the required telephone (6) and simulating pre-termination conditions at network termination (14) actual , signalling tones at the network edge are monitored by corresponding apparatus (16) to that present at customer premises (3).
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 February 4, 1997 and granted October 17, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 4, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 4, 2019.
- 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.