Utilization of the approximate location of a device determined from ambient signals
CA 2472828 C · Owner: Horvitz, Eric J. · Inventors: Horvitz, Eric J.; Miller, Edward C.; Krumm, John C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention employs approximate device locations determined from changes in the sensed strength of radio signals at different locations. In one instance of the invention the approximate device locations are based on inference procedures that are used to process ambient commercial radio signals to estimate a location or a probability distribution over the locations of a device. In another instance of the invention approximate device locations derived from learning and inference methods that are applied to rank vector of signal strength vectors are utilized. Moving to such rank orderings leads to methods that bypass consideration of absolute signal strengths in location …
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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.
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Timeline
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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.