Patents Assigned to Applied Data Research, Inc.
  • Telephone circuit monitoring system
    Patent number: 4066843
    Abstract: A telephone circuit monitoring system includes sampling means for repeatedly sampling the bistate and linear (a-c and d-c) control signals concurrently on a plurality of trunk circuits. When any of the circuits go off-hook, a central control initiates the sampling operation and repeatedly directs the sampling of the linear signals and bistate signals of each of a plurality of off-hook circuits until the monitoring purpose has been served.
    Type: Grant
    Filed: March 28, 1975
    Date of Patent: January 3, 1978
    Assignee: Applied Data Research, Inc.
    Inventors: David J. Waks, Adolf Futterweit