Patents by Inventor Terry John Burkhardt

Terry John Burkhardt 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).

  • Propylene impact copolymers
    Patent number: 6342566
    Abstract: This invention relates to propylene impact copolymer compositions. In particular, these unique and improved compositions can be produced using conventional, commercial-scale processes.
    Type: Grant
    Filed: May 21, 2001
    Date of Patent: January 29, 2002
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Terry John Burkhardt, Robert Tan Li, Aspy Keki Mehta, Udo M. Stehling, William T. Haygood, Jr., Francis C. Rix, Dawn C. Wiser
  • Propylene impact copolymers
    Publication number: 20010034411
    Abstract: This invention relates to propylene impact copolymer compositions. In particular, these unique and improved compositions can be produced using conventional, commercial-scale processes.
    Type: Application
    Filed: May 21, 2001
    Publication date: October 25, 2001
    Inventors: Terry John Burkhardt, Robert Tan Li, Aspy Keki Mehta, Udo M. Stehling, William T. Haygood, Francis C. Rix, Dawn C. Wiser
  • Polymerization catalyst systems
    Patent number: 6087291
    Abstract: This invention is generally directed toward a supported catalyst system useful for polymerizing olefins. The method for supporting the catalyst system of the invention provides for a metallocene catalyst and alumoxane activator supported on a porous support using a total volume of catalyst solution that is less than that of which a slurry is formed. The metallocene and alumoxane aer mixed in solution, then the solution is added to a porous support in a volume between the total pore volume of the support and the volume at which a slurry forms. The solvent is then removed, leaving an activated supported metallocene.
    Type: Grant
    Filed: October 24, 1997
    Date of Patent: July 11, 2000
    Assignee: Exxon Chemical Patents, Inc.
    Inventors: Anthony Nicholas Speca, Jeffrey Lawrence Brinen, George Alan Vaughan, Patrick Brant, Terry John Burkhardt
  • Alumoxanes, catalysts utilizing alumoxanes and polymers therefrom
    Patent number: 5902766
    Abstract: A catalyst which exhibits superior control of product particle size in the insertion polymerization of alpha-olefins is described as transition metal compounds which associate with non-coordinating alumoxane anions which are dispersed throughout the interior of a silica support in the form of particles which are less than or equal to about 50 .ANG. (5 nanometers) in diameter. This catalyst is capable of gas phase (e.g. heterogeneous) polymerization of propylene into product granules with a high degree of control over granule particle size distribution and bulk density.
    Type: Grant
    Filed: September 21, 1995
    Date of Patent: May 11, 1999
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Jeffrey Harold Butler, Terry John Burkhardt