Patents by Inventor Henri Chevrel

Henri Chevrel 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).

  • Pipe welding process using a metallic insert for improved corrosion resistance of the welded zone
    Patent number: 5368223
    Abstract: Avoidance of the corrosion initiation sites consisting of Mn particles deposited on the TiG welded inner tube surface is achieved through suppression of emission of manganese fumes by addition of a protective non corrosive metallic layer. The latter melts during the welding and arises in a non-corrosive internal metallic coating of the welded zone.
    Type: Grant
    Filed: May 6, 1993
    Date of Patent: November 29, 1994
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Henri Chevrel, Alain Boireau
  • Corrosion resistant welding of stainless steel
    Patent number: 5299731
    Abstract: A process for welding stainless steel tubing in the presence of an inert gas comprising a silicon base gas, in particular silane SiH.sub.4. During the welding operation, a suitable quantity of silicon is deposited by chemical vapor deposition at the weld joint to significantly improve the corrosion resistance of the weld.
    Type: Grant
    Filed: February 22, 1993
    Date of Patent: April 5, 1994
    Assignee: L'Air Liquide
    Inventors: A. Nimal Liyanage, Henri Chevrel, Alain Boireau, Jean-Marie Friedt