Patents by Inventor Pierre Ravenel

Pierre Ravenel 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).

  • Purification of pentafluoroethane
    Patent number: 5679876
    Abstract: The invention relates to the purification of pentafluoroethane (F125) containing chloropentafluoroethane (F115) by vapor-phase catalytic hydrogenolysis.A catalyst based on palladium deposited on aluminium trifluoride is employed.
    Type: Grant
    Filed: May 10, 1996
    Date of Patent: October 21, 1997
    Assignee: Elf Atochem S.A.
    Inventors: Serge Hub, Pierre Ravenel
  • Continuous process for the preparation of aluminum nitride by the carbonitriding of alumina
    Patent number: 5674465
    Abstract: The invention relates to a continuous process for the preparation of aluminum nitride by the carbonitriding of alumina. According to this process, a reaction that uses alumina, carbon, and a resin that generates carbon by pyrolysis is performed in a methodical reactor. The invention relates to a continuous process for the preparation of aluminum nitride by the carbonitriding of alumina.
    Type: Grant
    Filed: January 24, 1996
    Date of Patent: October 7, 1997
    Assignee: Elf Atochem S.A.
    Inventors: Pierre Ravenel, Roland Bachelard, Jean-Pierre Disson, Philippe Joubert
  • Carbonitriding of alumina to produce aluminum nitride
    Patent number: 5538705
    Abstract: Aluminum nitride (AlN) is continuously produced by continuously carbonitriding a continuously replenished charge of alumina, for example successive charges of alumina/carbon extrudates, in a reaction zone comprising at least one conduit, the ratio of the exchange surface area/volume of which at least one conduit ranging from 5 to 50 m.sup.-1, preferably from 10 to 50 m.sup.-1, and continuously withdrawing product AlN therefrom.
    Type: Grant
    Filed: September 13, 1994
    Date of Patent: July 23, 1996
    Assignee: ELF Atochem S.A.
    Inventors: Pierre Ravenel, Jean-Pierre Disson, Roland Bachelard
  • Carbonitriding of alumina to produce aluminum nitride
    Patent number: 5525321
    Abstract: The invention relates to a continuous process for the preparation of aluminium nitride by the carbonitriding of alumina.According to this process, the reaction, which employs alumina, carbon and nitrogen, is carried out in a moving-bed reactor characterized in that the reaction area has a plurality of conduits.
    Type: Grant
    Filed: September 16, 1994
    Date of Patent: June 11, 1996
    Assignee: Elf Atochem S.A.
    Inventors: Pierre Ravenel, Roland Bachelard