Patents by Inventor Jean Paul Duval

Jean Paul 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).

  • Test method for line equipment including a hybrid circuit and line equipment for its implementation
    Patent number: 7907720
    Abstract: The invention relates to methods for testing analog telephone line equipment including, in particular to detect faults in their hybrid resistor arrays. It consists in isolating the equipment from the telephone line and then applying the normal ringing signal to it. If the resistor array is defective, the output logic signal of the off-hook/on-hook detector circuit comprises a succession of 0 and 1 at the frequency of the ringing signal, which indicates the fault. This makes it possible to eliminate the equipment test relay usually employed.
    Type: Grant
    Filed: May 3, 2005
    Date of Patent: March 15, 2011
    Assignee: Alcatel-Lucent
    Inventors: Eric Lantoine, Christophe Henry, Jean Paul Duval