Patents by Inventor Friedrich Kiel

Friedrich Kiel 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).

  • Interactive cable television system
    Patent number: 4290142
    Abstract: An interactive cable television system for serving a plurality of user locations in a service area divided into a plurality of service regions, including a central office and a service network having a portion composed of parallel cables arranged in a tree pattern possessing a plurality of nodes remote from the user locations and, in the vicinity of the users, a further portion representing the lowermost plane of the network and composed of transmission cables connected to groups of user locations, the transmission cables being connected to each group in a star pattern, the system presenting a plurality of transmission paths and permitting multiple utilization of the paths, the parallel cables of the first mentioned portion of the network being connected in each service region in a tree structure extending from one node toward the user locations and being constituted by two parallel autonomous sets of cables, thus representing medium planes of the network, the network further including, in each service region
    Type: Grant
    Filed: February 22, 1979
    Date of Patent: September 15, 1981
    Assignee: Heinrich-Hertz-Institut fur Nachrichtentechnik Berlin GmbH
    Inventors: Rolf Schnee, Franz Kraus, Friedrich Kiel, Helmut Kliem, Wolfgang Krick, Herbert Landgraf