Patents by Inventor Paul N. Booth

Paul N. Booth 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).

  • Loop-start/ground-start line interface circuit
    Patent number: 4563547
    Abstract: A switchable common mode reference circuit for tip conductor and ring conductor line feed amplifiers provides a tip-ring common mode feedback reference for loop-start operations and a common mode fixed bias for ground-start operations. The functioning of the line feed arrangement is enhanced by using separately-sensed tip and ring current signals to control the switching function and by switching the line feed amplifiers between a current source mode for loop-start operation and a voltage source mode for ground-start operation.
    Type: Grant
    Filed: March 7, 1983
    Date of Patent: January 7, 1986
    Assignee: AT&T Bell Laboratories
    Inventor: Paul N. Booth