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Location systems and methods
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Patent number 8,050,687
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Issue date Nov 1, 2011
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Cambridge Positioning Systems Limited
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Peter James Duffett-Smith
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Radio positioning systems
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Patent number 7,359,719
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Issue date Apr 15, 2008
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Cambridge Positioning Systems Limited
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Peter James Duffett-Smith
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Positioning systems and methods
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Patent number 6,937,866
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Issue date Aug 30, 2005
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Cambridge Positioning Systems Limited
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Peter James Duffett-Smith
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Radio positioning systems
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Patent number 6,529,165
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Issue date Mar 4, 2003
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Cambridge Positioning Systems, Ltd.
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Peter James Duffett-Smith
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H04 - ELECTRIC COMMUNICATION TECHNIQUE