Patents by Inventor Jean Marie De Pra

Jean Marie De Pra 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).

  • Publication number: 20040094516
    Abstract: A process for the acquisition of data in the form of measurements and calculations, for diagnosis and decision assistance for an electric direct spark butt welder and for the resulting weld seams comprises the respective steps of measurement of the instantaneous alternating voltage at the terminals of the primary (19, 33) and of the secondary (16, 35, 36) of the welder transformer, and between the jaws (18, 39) of the welder dies; measurement of the instantaneous current in the primary (24, 34) and the secondary (17, 37, 38) of the transformer; measurement of the instantaneous displacement (41, 42) of the mobile die (4); storage in memory of said voltages, said currents and said displacement during the welding process; calculations of the energy supplied by the primary and the secondary, preferably to the jaws (5, 6), as a function of time; calculation of the energy supplied by the secondary to the jaws and of the heat energy dissipated during sparking as a function of the displacement of the mobile die; calc
    Type: Application
    Filed: December 30, 2003
    Publication date: May 20, 2004
    Inventors: Jean Marie De Pra, Eugene Butenko, Gilbert Roggen