Patents by Inventor David William Bartlett

David William Bartlett has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Transfer of calibrated time information in a mobile terminal
    Patent number: 8253628
    Abstract: A method of and system for calibrating un-calibrated time information within a mobile terminal 101 is disclosed. The terminal has a receiver 203 capable of receiving signals from which calibrated time information carried by a calibrated system (a satellite positioning system) can be extracted, and a receiver 200 capable of receiving signals from which un-calibrated time information carried by an un-calibrated stable system (a cellular communications system) may be extracted. The time offset between calibrated time information extracted from the calibrated system and un-calibrated time information extracted from the un-calibrated stable system is determined at a first terminal position where the signals from the un-calibrated stable system are available, the travel times of the signals from the un-calibrated stable system are known or determined, and the signals from the calibrated system are available.
    Type: Grant
    Filed: November 22, 2010
    Date of Patent: August 28, 2012
    Assignee: Cambridge Positioning Systems Limited
    Inventors: Peter James Duffett-Smith, Anthony Richard Pratt, David William Bartlett
  • TRANSFER OF CALIBRATED TIME INFORMATION IN A MOBILE TERMINAL
    Publication number: 20110187595
    Abstract: A method of and system for calibrating un-calibrated time information within a mobile terminal 101 is disclosed. The terminal has a receiver 203 capable of receiving signals from which calibrated time information carried by a calibrated system (a satellite positioning system) can be extracted, and a receiver 200 capable of receiving signals from which un-calibrated time information carried by an un-calibrated stable system (a cellular communications system) may be extracted. The time offset between calibrated time information extracted from the calibrated system and un-calibrated time information extracted from the un-calibrated stable system is determined at a first terminal position where the signals from the un-calibrated stable system are available, the travel times of the signals from the un-calibrated stable system are known or determined, and the signals from the calibrated system are available.
    Type: Application
    Filed: November 22, 2010
    Publication date: August 4, 2011
    Inventors: Peter James Duffett-Smith, Anthony Richard Pratt, David William Bartlett
  • Transfer of calibrated time information in a mobile terminal
    Patent number: 7852267
    Abstract: A method of and system for calibrating un-calibrated time information within a mobile terminal 101 is disclosed. The terminal has a receiver 203 capable of receiving signals from which calibrated time information carried by a calibrated system (a satellite positioning system) can be extracted, and a receiver 200 capable of receiving signals from which un-calibrated time information carried by an un-calibrated stable system (a cellular communications system) may be extracted. The time offset between calibrated time information extracted from the calibrated system and un-calibrated time information extracted from the un-calibrated stable system is determined at a first terminal position where the signals from the un-calibrated stable system are available, the travel times of the signals from the un-calibrated stable system are known or determined, and the signals from the calibrated system are available.
    Type: Grant
    Filed: July 25, 2006
    Date of Patent: December 14, 2010
    Assignee: Cambridge Positioning Systems Limited
    Inventors: Peter James Duffett-Smith, Anthony Richard Pratt, David William Bartlett