Patents by Inventor Guenter E. W. Hagedorn

Guenter E. W. Hagedorn 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 line control system
    Patent number: 3943305
    Abstract: Telephone line testing equipment in which a series of alternating current tone pulses are transmitted from the central office along the lines to a sensing means placed at a remote point in the circuit. The sensing means receives the coded tone pulse sequence, decodes it to determine if the address is correct, and if so, what information is present, and then either connects or disconnects the remote equipment from the line or, in the alternative, connects suitable loopback testing circuits to the line.
    Type: Grant
    Filed: November 11, 1974
    Date of Patent: March 9, 1976
    Assignee: Magnetic Controls Company
    Inventor: Guenter E. W. Hagedorn