Patents by Inventor Charles H. Culbertson

Charles H. Culbertson 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).

  • Direct digital technique for generating an AC waveform
    Patent number: 4105939
    Abstract: A digital circuit employing a programmable read only memory (PROM) provides direct digital driving of semiconductor devices comprising a bridge circuit of an inverter to develop a predetermined AC output waveform. The combination of the programmable read only memory and an up-down counter provides the capability of stopping the output waveform at predetermined points as well as reversing the phase direction of the AC output waveform to thereby permit greater control of an electrical system driven by the AC output waveform.
    Type: Grant
    Filed: August 10, 1976
    Date of Patent: August 8, 1978
    Assignee: Westinghouse Electric Corp.
    Inventor: Charles H. Culbertson