Patents by Inventor David C. Goodman

David C. Goodman 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).

  • Selective connection of power supplies
    Patent number: 4812672
    Abstract: A circuit for selectively connecting or disconnecting one of two power supplies, connected in parallel, in the event of the failure of one of the power supplies. The mechanism used is a MOSFET inserted "backwards" in a control circuit such that when the MOSFET is turned "off" no current drain is permitted through the diode internal to the MOSFET. Such a method provides fast switching and may be employed in other circuits as a replacement for relays.
    Type: Grant
    Filed: October 1, 1987
    Date of Patent: March 14, 1989
    Assignee: Northern Telecom Limited
    Inventors: Michael L. Cowan, David C. Goodman