Patents by Inventor Charles McGregor Stewart

Charles McGregor Stewart 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).

  • Radar receivers
    Patent number: 3983555
    Abstract: A radar receiver for a frequency-agile radar system includes a variable frequency oscillator and an automatic frequency control operable to exert fine control over the frequency generated by the local oscillator. Control means are provided to derive from a number of previous values of the local ocillator frequency a control signal for application to the local oscillator to bring the generated frequency close to that required for fine correction by the automatic frequency control.
    Type: Grant
    Filed: July 12, 1974
    Date of Patent: September 28, 1976
    Assignee: Ferranti, Limited
    Inventors: John Malcolm Morrison, Charles McGregor Stewart