Patents by Inventor David Robert Hughes

David Robert Hughes 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 data communication network and control system therefor
    Patent number: 3979723
    Abstract: A digital data communication network in which half-duplex communications are established between a central station and a plurality of remote terminal devices under control of the central station and in which said remote terminal devices are grouped and each group is serially connected and receives data signals in parallel over a simplex link from the central station and in which one group of serially connected stations is selectively connected to a second simplex link for transmitting, in a predetermined sequence, data signals to the central station.
    Type: Grant
    Filed: October 29, 1975
    Date of Patent: September 7, 1976
    Assignee: International Business Machines Corporation
    Inventors: David Robert Hughes, Alexander Polischuk-Sawtschenko