Patents by Inventor Keith C. Schmid

Keith C. Schmid 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 voltage bypass power system architecture
    Patent number: 5646462
    Abstract: A power plant system architecture includes a plurality of battery polarity switching circuits for providing uninterruptible power/voltage to a plurality of loads, each of which is powered by low frequency AC, and which is also powered by a DC voltage. DC voltage is substituted for the AC voltage applied to the load should the voltage polarity processing circuitry in the power plant fail.
    Type: Grant
    Filed: August 3, 1995
    Date of Patent: July 8, 1997
    Assignee: Lucent Technologies Inc.
    Inventors: Timothy M. Cortes, Robert John Kakalec, Keith C. Schmid
  • Battery polarity switch for generating low frequency voltage waveforms
    Patent number: 5612859
    Abstract: A bipolar switching circuit converts an applied DC voltage to a low frequency AC voltage by periodically transmitting and inverting the applied DC voltage. The bipolar circuitry in one embodiment includes four switches which are switched in pairs to alternately provide a direct transmission of the input DC voltage and an inverted version of the DC input voltage.
    Type: Grant
    Filed: May 3, 1995
    Date of Patent: March 18, 1997
    Assignee: Lucent Technologies Inc.
    Inventors: Robert J. Kakalec, Keith C. Schmid