Patents by Inventor Louis Dujardin

Louis Dujardin 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).

  • Process and apparatus for the in-line inspection of the depth of a weld by a pulse beam
    Patent number: 4567345
    Abstract: A process for the in-line inspection of the depth of a weld carried out by a welding beam pulse in which around its impact point on a workpiece, the beam pulse produces a welding plasma wherein, only during the emission of a welding beam pulse, at least one selected monochromatic emission line of the welding plasma is optically collected from the workpiece. The energy of said lines is converted into analog electrical signals and those signals are digitally processed with the resulting signals being compared with reference signals to produce an indication of the weld depth. Apparatus for performing this process is also disclosed.
    Type: Grant
    Filed: December 12, 1983
    Date of Patent: January 28, 1986
    Assignee: Commissariat a l'Energie Atomique
    Inventors: Bernard Bachet, Jean Daguet, Louis Dujardin