Combined relative and absolute positioning method and apparatus
CA 2116242 C · Owner: Poppen, Richard F. · Inventors: Mathis, Darrell L.; Poppen, Richard F.; Milnes, Kenneth A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A navigation system (1) comprising a relative positioning system (RPS) (2) with dead reckoning and map matching and an absolute positioning system (APS) (3) is provided and operated in such a manner that APS position information is used for updating RPS (2) position and contour of equal probability (CEP) information as required. The APS (3) may comprise a Loran-C or a global positioning system (GPS). Different criteria are used for resetting the RPS (2) depending on whether or not the navigation system comprises a Loran-C or a GPS due to the different levels of precision of the Loran-C and the GPS. When the RPS (2) is reset or updated, it is updated to the current APS (3) position with its …
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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 31, 1992 and granted September 24, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 31, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 31, 2014.
- 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
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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.