Patents by Inventor Joel Bertrand

Joel Bertrand 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).

  • Rotary gas dispersion device for treating a liquid aluminium bath
    Patent number: 6060013
    Abstract: A rotary gas dispersion device for use in a liquid aluminium treatment vessel is disclosed. The device is useful for reducing surface disturbance, splashing and vortices while maintaining the effectiveness of the treatment. Said device includes a rotor (1) consisting of a set of blades (5) and a substantially flat disc (4) thereabove. Gas is injected through the central hub and side ports (10) between the blades. The ratio of the outer diameter of the rotor to the diameter of the central hub thereof is of 1.5-4.
    Type: Grant
    Filed: March 8, 1999
    Date of Patent: May 9, 2000
    Assignees: Pechiney Rhenalu, Aluminium Pechiney
    Inventors: Pierre Le Brun, Catherine Xuereb, Joel Bertrand
  • Production of high molecular weight, essentially uncrosslinked polychlorophosphazenes
    Patent number: 5152971
    Abstract: High molecular weight, essentially uncrosslinked polychlorophosphazenes are prepared by bulk polycondensing a monomer of the formula P.sub.2 NXCl.sub.2, in which X is an oxygen or sulfur atom, e.g., N-dichlorophosphoryl- or N-dichlorothiophosphoryl-P-trichlorophosphazene, and wherein at least that final stage of polycondensation following cessation of evolution of PXCl.sub.3 is carried out in a stirred reaction zone, such stirred reaction zone including means to prevent the accumulation of polycondensate on the stirrer.
    Type: Grant
    Filed: May 21, 1990
    Date of Patent: October 6, 1992
    Assignee: Atochem
    Inventors: Joel Bertrand, Philippe Potin