Patents by Inventor Dennis L. Whitson

Dennis L. Whitson 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).

  • Active speech network circuit for a telephone set
    Patent number: 4332984
    Abstract: In a subscriber telephone set, an active speech network provides a sidetone signal and for equalization of the transmit and receive signals at the tip and ring line port and also maintains the dc voltage at a substantially constant level at this port. The network is compatible with conventional telephone sets and operation on long loops in parallel with such sets is provided for. Internal circuitry (320) within the network check both loop current and tip-to-ring voltage to ensure that both are of a magnitude sufficient for a tone signaling dial (301) to properly generate tone signals before enabling the dial.
    Type: Grant
    Filed: December 13, 1979
    Date of Patent: June 1, 1982
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Paul C. Davis, Raymond G. Jackson, Kenneth F. Sodomsky, Dennis L. Whitson