Patents by Inventor Siegfried Guntersdorfer

Siegfried Guntersdorfer 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).

  • Apparatus utilizing a phantom circuit for connecting additional subscribers to a telecommunication system
    Patent number: 3975594
    Abstract: A subscriber line circuit for telecommunication systems in which additional message signals, e.g., video signals, can be transmitted is described. The line circuit is constituted by two balanced line pairs which, if necessary, can have line amplifiers interposed therein. A remote supply circuit for the amplifiers, constructed in the form of a phantom circuit, is used, and this phantom circuit is used, as well, as the transmission circuit for the additional message signals. A subscriber set for the additional message signals is connected to the phantom circuit. A feed to the latter subscriber set, as well as two way communication take place over the phantom circuit.
    Type: Grant
    Filed: February 10, 1975
    Date of Patent: August 17, 1976
    Assignee: Siemens Aktiengesellschaft
    Inventor: Siegfried Guntersdorfer