Patents by Inventor Keith James Bruno Grainge

Keith James Bruno Grainge 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).

  • Position determining system
    Patent number: 6342854
    Abstract: The invention relates to a position determining system, for receiving digital telephone signals transmitted by a number of transmission sources BTS. The system has a pair of receiving stations, CBU and CRU, one at a known position O and another on a roving object R; a position determining processor CPP; and means for passing a link signal, L1 and L2, from each of the receiving stations to the position determining processor, the link signal containing information about the signals received at the receiving station from the transmission sources. Each of the receiving stations is arranged to receive the signals from the respective transmission sources substantially simultaneously. The position determining processor is arranged to compare the information received from the one receiving station with the information received at the other receiving station, and to determine the time delay between the respective signals received at both receiving stations in order to determine the position of the roving object.
    Type: Grant
    Filed: February 17, 2000
    Date of Patent: January 29, 2002
    Assignee: Cambridge Positioning Systems Ltd.
    Inventors: Peter James Duffett-Smith, Keith James Bruno Grainge
  • Position determining system
    Patent number: 6094168
    Abstract: The invention relates to a position determining system, for receiving digital telephone signals transmitted by a number of transmission sources BTS. The system has a pair of receiving stations, CBU and CRU, one at a known position O and another on a roving object R; a position determining processor CPP; and means for passing a link signal, L1 and L2, from each of the receiving stations to the position determining processor, the link signal containing information about the signals received at the receiving station from the transmission sources. Each of the receiving stations is arranged to receive the signals from the respective transmission sources substantially simultaneously. The position determining processor is arranged to compare the information received from the one receiving station with the information received at the other receiving station, and to determining the time delay between the respective signals received at both receiving stations in order to determine the position of the roving object.
    Type: Grant
    Filed: March 17, 1998
    Date of Patent: July 25, 2000
    Assignee: Cambridge Positioning Systems Ltd.
    Inventors: Peter James Duffett-Smith, Keith James Bruno Grainge