Patents by Inventor Georges Duval

Georges Duval 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).

  • Device for the suppression of a pilot frequency in a multiplex transmission system
    Patent number: 3949173
    Abstract: A device for suppressing a pilot wave in a spectrum of frequencies by subtraction of an auxiliary frequency adjusted in frequency, in phase, and in amplitude to adequate values, used in frequency multiplex telephone transmission systems, containing two pilot frequencies in cases where maintaining either one or several of these frequencies would lead to disturbances.
    Type: Grant
    Filed: October 18, 1973
    Date of Patent: April 6, 1976
    Assignee: Compagnie Industrielle des Telecommunications Cit-Alcatel
    Inventors: Georges Duval, Robert Bonneton, Christian Poinas