Patents by Inventor Donald M. Duft

Donald M. Duft 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).

  • DC feedback circuit using sample and hold circuits
    Patent number: 5233312
    Abstract: Sample and hold circuits are used to detect a DC component of an AC signal on an amplifier's output to generate a feedback signal that is applied to the amplifier's input to cancel out a DC component of an AC input signal. The sample and hold circuits detect the peak excursions of the AC output signal and apply the stored peaks to averaging circuitry which determines the magnitude of the DC component of the output signal.
    Type: Grant
    Filed: April 23, 1992
    Date of Patent: August 3, 1993
    Assignee: Micro Motion, Incorporated
    Inventors: Donald M. Duft, Gerald R. Ellis, Paul Z. Kalotay