Patents by Inventor John C. Bracken

John C. Bracken 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).

  • High accuracy frequency modulation waveform tester
    Patent number: 4806853
    Abstract: The maximum and minimum depth of modulation of a carrier signal frequency modulated by a modulating sine wave is measured by a frequency counter responsive to an external gate. The external gate is generated by detecting the positive-going and negative-going zero crossings of the modulating signal and providing a gate generating trigger delayed by 90.degree. of the modulating signal less a predetermined number of cycles of the carrier. The parameters are selected such that the gate is centered around the positive and negative peak amplitudes of the modulating signal.
    Type: Grant
    Filed: January 25, 1988
    Date of Patent: February 21, 1989
    Assignee: Unisys Corporation
    Inventors: Herman J. Fleischer, John C. Bracken