Cellular radio location system
CA 2219783 C · Owner: Telecom Securicor Cellular Radio Limited · Inventors: Gannon, Stephen Mark; Munday, Peter Robert; Goetz, Ian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The location of a mobile unit M of a cellular radio system is determined by determining the differences in timing of a characteristic feature of the transmission of the control channel of each base station A B, C, D, E as , measured at the mobile unit. Preferably the characteristic feature is the training sample already used by the mobile unit in cellular systems to measure signal strength in order to inform handover decisions. By determining the differences between time of arrival of transmissions from four base stations A, B, C, D, position in two dimensions can be derived without prior knowledge of the actual distance to any of the base stations. A fifth base station E allows …
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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 May 1, 1996 and granted July 23, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 1, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 1, 2018.
- 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.