Patents by Inventor Peter K. van der Gracht

Peter K. van der Gracht 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).

  • Modem for pseudo noise communication on A.C. lines
    Patent number: 4835517
    Abstract: A modem which may operate as a transmitter or receiver, is provided for use on a line carrying an A.C. signal. The modem comprises a pseudorandom code generator which produces a pseudorandom code signal of a frequency an integral multiple of the A.C. signal frequency. Synchronization means synchronizes the code signal with the A.C. signal. Preferably a coherent system is provided in which a data signal involved has a bit rate an integral multiple of the A.C. signal frequency and in which a carrier generator is additionally provided to produce a carrier signal of a frequency an integral multiple of the A.C. signal frequency. In such case, the synchronization means also synchronizes the data bit and carrier signals with the A.C. signal.
    Type: Grant
    Filed: June 20, 1984
    Date of Patent: May 30, 1989
    Assignee: The University of British Columbia
    Inventors: Peter K. van der Gracht, Robert W. Donaldson