Patents by Inventor Xavier Bontemps

Xavier Bontemps 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).

  • Apparatus for gas phase polymerization of olefins in a fluidized bed reactor
    Patent number: 5382638
    Abstract: A process for polymerizing olefins in a gas-phase fluidized-bed reactor comprising a reactor body (1), optionally surmounted by a disengagement chamber (2), in which fine particles entrained by the gas mixture leaving the top of the reactor are separated from the gas and recycled to the upper portion of the reactor body. Polymer is withdrawn from the reactor body (1) via at least two polymer outlets, at least one of which (15) is in the lower portion of the reactor body (1) and at least one of which (16) is in the upper portion of the reactor body at a position below the top of the fluidized bed. The invention includes apparatus for polymerizing olefins and the use of the apparatus.
    Type: Grant
    Filed: February 7, 1992
    Date of Patent: January 17, 1995
    Assignee: BP Chemicals Limited
    Inventors: Xavier Bontemps, Laszlo Havas, Andre Martens, Frederic R. M. M. Morterol