Patents by Inventor Bernard Reynaud

Bernard Reynaud 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 for striking an arc in electric welding and welding torch employing said process
    Patent number: 4855566
    Abstract: The invention relates to a process for striking an arc and to a torch employing said process. An electronic ignitor located at a maximum distance of 8 meters from the torch has a high-voltage conductor which leads to a spark gap adjacent the part to be welded. The high-voltage circuit is closed in the region of the zone to be ionized between the welding electrode and the part.
    Type: Grant
    Filed: April 20, 1987
    Date of Patent: August 8, 1989
    Assignee: L'Air Liquide
    Inventors: Jean-Francois Hays, Pierre Legrand, Eric Verna, Michel Delzenne, Bernard Reynaud, Pierre Gaillard
  • Process and installation for automatic ignition of a plasma cutting torch
    Patent number: 4280042
    Abstract: The invention relates to a plasma cutting plant comprising a principal generator feeding a plasma arc between a workpiece and an electrode of a torch comprising a tube, with initial ignition by means of an ignition or striking arc between the electrode and the tube, via the resistor and the contactor. A circuit comprising a resistor and an excitation coil of a relay is installed across the terminals of the contactor. When the torch has been brought to the correct distance from the workpiece, the circuit detects this correct spacing and acts on the feed motor to stop the latter immediately.
    Type: Grant
    Filed: January 22, 1980
    Date of Patent: July 21, 1981
    Assignees: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude, La Soudure Autogene Francaise
    Inventors: Jean-Yves Berger, Michel Kostelitz, Bernard Reynaud, Raymond Egee