Patents by Inventor Oliver P. Leisten

Oliver P. Leisten 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).

  • Superheterodyne radio receiver
    Patent number: 5832375
    Abstract: A satellite navigation receiver uses common dual-conversion superheterodyne and frequency synthesiser circuitry for receiving signals from both the GPS and the GLONASS satellite navigation systems. Successive first and second frequency down-converters in the receiver chain are fed by first and second local oscillator signals which are both variable in frequency such that the frequency of the first local oscillator signal is an integral multiple (preferably 8) of the second local oscillator signal. This relationship is provided by a binary divider (32) at least a portion of which may form part of a digital frequency synthesiser loop.
    Type: Grant
    Filed: November 14, 1996
    Date of Patent: November 3, 1998
    Assignee: SymmetriCom, Inc.
    Inventors: Oliver P. Leisten, Raymond J. Hasler
  • Heterodyne radio receiver with plural variable frequency local oscillator signals
    Patent number: 5606736
    Abstract: A satellite navigation receiver uses common dual-conversion superheterodyne and frequency synthesizer circuitry for receiving signals from both the GPS and the GLONASS satellite navigation systems. Successive first and second frequency down-converters in the receiver chain are fed by first and second local oscillator signals which are both variable in frequency such that the frequency of the first local oscillator signal is an integral multiple (preferably 8) of the second local oscillator signal. This relationship is provided by a binary divider (32) at least a portion of which may form part of a digital frequency synthesizer loop.
    Type: Grant
    Filed: November 9, 1994
    Date of Patent: February 25, 1997
    Assignee: SymmetriCom, Inc.
    Inventors: Raymond J. Hasler, Oliver P. Leisten