Patents by Inventor David L. Hedderly

David L. Hedderly 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).

  • Outstation ranging in demand assignment, time division multiple access, communication system
    Patent number: 5559805
    Abstract: In a multi-station, demand assigned, time division multiple access system, digital information is communicated from a head end to a population of outstations so that all the outstations receive the stone stream of digital information and select their traffic from it. Traffic is only sent to and from an outstation when there is a demand for it. As the outstations are at random ranges from the head end, it is necessary to know the times of travel for bursts of information so they arrive at the head end sequentially. Free time in each frame is consolidated and made available for ranging-in outstations.
    Type: Grant
    Filed: August 22, 1994
    Date of Patent: September 24, 1996
    Assignee: GPT Limited
    Inventor: David L. Hedderly