Patents by Inventor Gilbert Berthereau

Gilbert Berthereau 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).

  • Pump impeller seals with spiral grooves
    Patent number: 4242039
    Abstract: The present invention relates to internal and shaft outlet seals of a pump. On both sides of a paddle-wheel are arranged a pair of coaxial discs (22-23) and (24-25), the face of one disc being smooth and the face of the other disc having spiral grooves, one of the discs of each pair being interlocked in rotation with wheel 5, whereby the liquid between two discs is subjected to a pressure increase radially outwardly compensating at least for the pressure increase due to pumping by wheel 5.
    Type: Grant
    Filed: November 15, 1978
    Date of Patent: December 30, 1980
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Jean-Claude Villard, Gilbert Berthereau