System and method for detecting unauthorized use of a cellular telephone
CA 2293450 A1 · Owner: Nortel Networks Corporation · Inventors: Thurley, Richard N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A system and method for detecting and preventing cellular fraud in a cellular network. The network includes a database such as a home location register that stores a listing of potential terminating numbers that the authorized user is allowed to call. Therefore, whenever a call is initiated by a cellular telephone using the identification number of the authorized user the called , number is compared to the listing. If the called number is in the listing the , call completes normally. If not, an additional level of security can be provided. For example, the caller may be prompted for a security code the , caller may be transferred to a service center or the caller may be , transferred …
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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 June 10, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 10, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 10, 2020.
- 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.