Patents by Inventor Theo J. P. Stevens

Theo J. P. Stevens 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).

  • Patent number: 6271165
    Abstract: This invention relates to supported and nonsupported catalyst components comprising (a) an ionic compound comprising (a)(1) a cation and (a)(2) an anion having up to 100 nonhydrogen atoms and the anion containing at least one subtituent comprising a moiety having an active hydrogen reacted with (c) an organometal or metalloid compound wherein the metal or metalloid is selected from Groups 2, 12, 13, or 14 of the Periodic Table of the Elements, and, optionally, (b) a transition metal compound, (d) a support material, and/or a diluent. Included are methods for preparation of the catalyst components, catalysts, reaction products and dispersions thereof, as well as polymerization process using the catalyst.
    Type: Grant
    Filed: June 21, 1999
    Date of Patent: August 7, 2001
    Assignee: The Dow Chemical Company
    Inventors: Grant B. Jacobsen, Pierre H. H. Loix, Theo J. P. Stevens
  • Patent number: 5783512
    Abstract: A non-supported solid catalyst comprising (a) an ionic compound comprising a.1) a cation and a.2) an anion having up to 100 nonhydrogen atoms and said anion containing at least one substituent comprising an active hydrogen moiety, (b) a transition metal compound, and (c) an organometal compound wherein the metal is selected from the Groups 1-14 of the Periodic Table of the Elements; a supported solid catalyst comprising (a), (b), (c), and (d) a support material, obtainable by combining components (a), (b), (c), and (d) in any order, and wherein during at least one step in the preparation of the solid catalyst, component (a) dissolved in a diluent in which (a) is soluble, is converted into solid form; a method for preparing the solid catalysts; and a process of polymerization using these solid catalysts.
    Type: Grant
    Filed: December 18, 1996
    Date of Patent: July 21, 1998
    Assignee: The Dow Chemical Company
    Inventors: Grant B. Jacobsen, Theo J. P. Stevens, Pierre H. H. Loix