Telephone technician's remote assist apparatus and method
CA 2313658 C · Owner: Bright, Carl P. · Inventors: Bright, Carl P.; Butler, Myron C.; Hilligoss, Lawrence O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A telephone technician's remote assist apparatus connects into a telephone line to be, tested by the technician from a remote location. Control signals are sent from the remote, location to the remote assist apparatus over the same pair of wires of the telephone line under, test. A particular control signal encoding includes two consecutive leading star (**) dual-tone, multi-frequency tones. The remote assist apparatus opens the telephone line in response to at, least one control signal and the apparatus preferably automatically restores the line after a, predetermined time so that the subscriber is not left disconnected. The particular control signal, encoding and the automatic …
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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 July 10, 2000 and granted April 1, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 10, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 10, 2022.
- 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.