A telecommunications system
CA 2114533 C · Owner: Martin, Andrew Louis · Inventors: Mcleod, Norman William; Martin, Andrew Louis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A telecommunications system (2) having a cellular mobile telephone system (6) in which calls from cellular telephones (20) are routed through a mobile service switching centre exchange (14 30). Users of the system, having control of respective groups of mobile telephones (20) are able via user terminals (110) to access respective databases in a signalling processor (100) and to place in the database information about call parameters such as call restrictions, for, ones of the telephones of that users controlled group. When a call is made from any mobile telephone (20) the call signal is decoded at the relevant exchange (14, 30) and a determination made as to whether the call originates from …
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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 31, 1992 and granted March 18, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 31, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 31, 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.