Patents by Inventor Donald E. Whitaker

Donald E. Whitaker 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).

  • High impedance loop-seizing and dial pulsing circuit
    Patent number: 4151377
    Abstract: An improved loop-seizing and dial pulsing circuit arrangement of the type employed in telephone trunks has an extremely low insertion loss. The circuit comprises a diode bridge connected across a telephone loop and a controlled constant current source connected across the bridge. A current limiting diode also referred to as a constant current diode is used to establish a bias current for the constant current source.
    Type: Grant
    Filed: January 3, 1978
    Date of Patent: April 24, 1979
    Assignee: International Telephone and Telegraph Corporation
    Inventor: Donald E. Whitaker