Patents by Inventor Helmuth Preisach

Helmuth Preisach 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).

  • Digital circuit-switching and packet-switching network and switching facility therefor
    Patent number: 4903260
    Abstract: A digital switching network is disclosed in which paths can be preset from any inlet to any outlet either for circuit-switched connections or for packet-switched messages (packets), as required. At any point in time, the paths preset for the packet-switched messages form a network whose nodes lie in the switching facilities of the switching network. The switching facilities contain the functional units required to switch each data packet on the path preset for it. This makes it possible to dynamically divide a single switching network into a circuit-switching network and a packet-switching network as required.
    Type: Grant
    Filed: January 28, 1988
    Date of Patent: February 20, 1990
    Assignee: Alcatel N.V.
    Inventors: Dietrich Boettle, Helmuth Preisach, Karl Schrodi