Patents by Inventor John R. Hemmert

John R. Hemmert 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).

  • Telephone signalling test system
    Patent number: 4165450
    Abstract: Telephone signalling test apparatus is provided for monitoring telephone lines under live traffic conditions. The apparatus is modular with a main frame having a line interface and central control and storage unit, as well as numerical display.
    Type: Grant
    Filed: May 17, 1978
    Date of Patent: August 21, 1979
    Assignee: Northern Telecom Inc.
    Inventors: C. Terry Throop, Richard E. Moffett, John R. Hemmert, Robert E. Sawyer, Jr.