Patents by Inventor Douglas A. Hahn

Douglas A. Hahn 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).

  • Patent number: 5369680
    Abstract: An apparatus for verifying the central office billing translations from a remote location is disclosed. The system includes a processor with software which generates patterned telephone calls through a test set at the switch at a switching station to all working access codes. The billing information of these calls is then recorded. Once the recorded information is processed, the records which originated from the test set are identified by their assigned telephone number. These records are extracted and preferably recorded such that they can be automatically verified against an accurate routing and billing table for the specific site. The table is preferably stored in the test set.
    Type: Grant
    Filed: March 9, 1993
    Date of Patent: November 29, 1994
    Assignee: Illinois Bell Telephone Company
    Inventors: William F. Borbas, Douglas A. Hahn, Thomas W. Mines
  • Patent number: 4937850
    Abstract: The present invention provides a test set which checks the communication line from a central office to a telephone responder which has a predetermined telephone number and which generates an output signal consisting of a predetermined sequence of signals. The checking is performed from a central testing station from where an operator inputs a test signal which identifies the telephone number of the test set located in the central office from which the test is to be made. Once the connection is established, the telephone number of the responder to be called is transmitted. The test set includes a signal detector which identifies an input signal. The signal detector is interfaced to the responder transmission medium such that the signal detector receives responder output signal as an input signal. The test set further includes a memory which includes the correct signal which should be received from the responder with called telephone number, and a processor.
    Type: Grant
    Filed: December 22, 1988
    Date of Patent: June 26, 1990
    Assignee: Illinois Bell Telephone Company
    Inventors: William F. Borbas, Robert D. Hahn, Douglas A. Hahn