Patents by Inventor Robert W. Lembke

Robert W. Lembke 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).

  • Disconnect circuit for use between telephone switching systems
    Patent number: 4645880
    Abstract: A disconnect circuit for use between two switching systems. An optical coupler monitors open and closed current loop conditions and provides signals representative thereof. Monostable multivibrators are operated in response to these signals to provide timing signals of predetermined durations. A relay circuit is controlled by these timing signals and it operates to disconnect the loop between the switching systems for a predetermined time.
    Type: Grant
    Filed: September 27, 1984
    Date of Patent: February 24, 1987
    Assignee: GTE Communication Systems Corp.
    Inventors: Robert W. Lembke, Howard J. Wiebeld
  • Coin trunk test set
    Patent number: 4582965
    Abstract: A test set which tests coin trunk circuits for both normal and abnormal operations. A pair of light-emitting diodes monitor battery feed and reverse current. A first set of switch contacts simulate coin deposit while a second set of switch contacts connect fault, re-ring, coin deposit and coin return monitoring lamps and circuit paths to the coin trunk circuit.
    Type: Grant
    Filed: August 23, 1984
    Date of Patent: April 15, 1986
    Assignee: GTE Communication Systems Corporation
    Inventor: Robert W. Lembke