Improving the security of mobile telephones against eavesdropping
CA 2286964 A1 · Owner: Alcatel · Inventors: Wilhelm, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of detecting an eavesdropping device (IC) which is interposed between a mobile telephone (MT) and a base station (BS2) and which accepts as a purported, base station, a call from the mobile telephone (MT) and then forwards it, as a purported mobile telephone to, the base station (BS2) involves storing data of the base stations (BS1, ... BS5) used by the mobile telephone (MT) in the mobile telephone (MT). When a new connection is set up to a base station (BS2) the data, newly determined during this connection setup are compared with the data to be expected for this base station (BS2) in view of the stored data. If the data differ, an error signal is generated in the mobile telephone …
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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 October 20, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 20, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 20, 2021.
- 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.