Patents by Inventor Duane Mortensen

Duane Mortensen 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).

  • System and method for locating mobile devices
    Patent number: 6574478
    Abstract: A system for locating one of a plurality of mobile communications devices is provided. A transmitter (24) transmits a first signal (S1), with the first signal having a device identification code for identifying a particular mobile communications device to be located and a time indicator. Retransmission circuitry (40, 60) in the selected mobile communications device (20) receives the first signal and transmits a second signal (S2) in response thereto. Each of a plurality of receivers (22) has an internal clock. When the first signal is received, these clocks are set based on the time indicator in the first signal. When the second signal is received, a time difference between the first signal and second signal is determined. Network control circuitry (26) determines the location of the particular mobile communications device responsive to time differences determined by multiple receivers.
    Type: Grant
    Filed: August 11, 2000
    Date of Patent: June 3, 2003
    Assignee: Alcatel USA Sourcing, L.P.
    Inventor: Duane Mortensen