Patents by Inventor Michel Avaro

Michel Avaro 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).

  • Process for preparing a prepolymerized olefin polymerization catalyst
    Patent number: 5494871
    Abstract: A stable, long-lived catalyst composition, well suited for the polymerization of olefins, e.g., of ethylene, comprises intimate admixture of particulates of an olefin prepolymer and a catalytically effective amount of particles of a metallic olefin polymerization catalyst, such olefin prepolymer particulates having a particle size distribution narrower than the particle size distribution of the metallic catalyst particles.
    Type: Grant
    Filed: February 3, 1995
    Date of Patent: February 27, 1996
    Assignee: Elf Atochem S.A.
    Inventors: Claude Brun, Michel Avaro
  • Polymerization of olefins with pre-activated catalysts
    Patent number: 4042771
    Abstract: A method for the polymerization of olefins using a catalyst in the form of a solid compound of a transition metal in which the transition metal is at least partially reduced to a valency state lower than the maximum valency state, with the transition metal compound being subjected prior to use to pre-activation by contact with magnesium and one or more halogenated hydrocarbons and one or more organo-metallic compounds of Groups II and III.
    Type: Grant
    Filed: September 18, 1975
    Date of Patent: August 16, 1977
    Assignee: Naphtachimie
    Inventors: Michel Avaro, Pierre Mangin
  • Method of polymerizing olefins
    Patent number: 3995098
    Abstract: The method of polymerizing olefins which includes the preparation of a pre-activated compound of a transition metal of IVa, Va and VIa of the periodic table of elements, in which the transition metal is at least partially in a reduced valency state, in which the pre-activation is carried out by contacting the transition metal compound with an organomagnesium compound and then polymerizing the olefins in the presence of the pre-activated transition metal compound and an organo-aluminum compound.
    Type: Grant
    Filed: March 18, 1974
    Date of Patent: November 30, 1976
    Assignee: Naphtachimie
    Inventors: Michel Avaro, Pierre Mangin