Patents by Inventor Walter S. Duspiva

Walter S. Duspiva 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).

  • Regulated power supply with electrically isolated control and variable impedance means in series with on-off control means
    Patent number: 5091837
    Abstract: In a regulated power supply, particularly a pulse-width-modulated supply, the on-off control is located in the feedback path between the supply output terminal and the pulse-width-modulator. Transformer coupled polling pulses sense both the state of the on-off control and the magnitude of the feedback error signal.
    Type: Grant
    Filed: January 31, 1991
    Date of Patent: February 25, 1992
    Assignee: International Business Machines Corporation
    Inventors: Walter S. Duspiva, John B. Gillett
  • Transformer having plural-turn core
    Patent number: 4965712
    Abstract: A transformer has a multi-turn magnetic core about a loop of conductor. A bridge transformer has one turn of the core about one half of the conductor loop and a second turn of the core about the other half of the conductor loop, and an electrical center tap connection to the loop between the two halves thereof. Embedded diodes connect the ends of the loop to an external circuit.
    Type: Grant
    Filed: July 29, 1989
    Date of Patent: October 23, 1990
    Assignee: International Business Machines Corporation
    Inventors: Walter S. Duspiva, John B. Gillett, James H. Spreen