Methods for determining the approximate location of a device from ambient signals
CA 2472995 C · Owner: Krumm, John C. · Inventors: Krumm, John C.; Miller, Edward C.; Cermak, Gerald F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention leverages changes in the sensed strength of radio signals at different locations to determine a device's location. In one instance of the invention inference procedures are used to process ambient commercial radio signals to estimate a location or a probability distribution over the locations of a device. In an instance of the invention learning and inference methods are applied to rank vector of signal strength vectors. Moving to such rank orderings leads to methods that bypass consideration of absolute signal strengths in location calculations. The invention facilitates approximations for locating a device by providing a method that does not require a substantial …
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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 2, 2004 and granted May 1, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 2, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 2, 2026.
- 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.