Patents by Inventor Fred L. Vance, Jr.

Fred L. Vance, Jr. 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).

  • Polymerization of olefins in the presence of chromium-containing catalysts
    Patent number: 4380616
    Abstract: Olefins are polymerized in the presence of chromium-containing catalysts which have been improved by depositing the chromium onto the inorganic oxide support in the vapor phase rather than as an inorganic or organic compound. The resulting polymers exhibit a higher molecular weight as compared to those polymers prepared in the presence of such chromium-containing catalysts prepared in the conventional manner.
    Type: Grant
    Filed: May 14, 1981
    Date of Patent: April 19, 1983
    Assignee: The Dow Chemical Company
    Inventors: Fred L. Vance, Jr., Rafael E. Guerra, Christopher P. Christenson
  • Organo zirconium-chromium compound, catalyst prepared therefrom and polymerization of olefins therewith
    Patent number: 4376065
    Abstract: Dual transition metal compounds containing zirconium and chromium are prepared by reacting a tetrahydrocarbyloxy zirconium compound such as tetraisopropoxy zirconium or a tetravalent hydrocarbyloxy zirconium halide such as triisopropoxy zirconium halide with a chromium compound such as CrO.sub.3. These compounds, as well as combinations of other soluble chromium and zirconium compounds, are useful in the polymerization of .alpha.-olefins to produce polymers having a high molecular weight and a narrow molecular weight distribution.
    Type: Grant
    Filed: June 1, 1981
    Date of Patent: March 8, 1983
    Assignee: The Dow Chemical Company
    Inventors: Randall S. Shipley, Fred L. Vance, Jr.
  • Chromium-containing catalysts for polymerizing olefins
    Patent number: 4362654
    Abstract: Inorganic oxide supported chromium-containing catalysts are improved by depositing the chromium onto the inorganic oxide support in the vapor phase rather than as an inorganic or organic compound. Polymers resulting from polymerizing one or more .alpha.-olefins in the presence of such catalysts exhibit a higher molecular weight as compared to those polymers prepared in the presence of such chromium-containing catalysts prepared in the conventional manner.
    Type: Grant
    Filed: May 14, 1981
    Date of Patent: December 7, 1982
    Assignee: The Dow Chemical Company
    Inventors: Fred L. Vance, Jr., Rafael E. Guerra, Christopher P. Christenson
  • Organo titanium chromium compound, catalyst prepared therefrom and polymerization of olefins therewith
    Patent number: 4321159
    Abstract: Dual transition metal compounds containing titanium and chromium are prepared by reacting a hydrocarbyloxy titanium halide with CrO.sub.3. The compounds are useful in catalysts for the polymerization of .alpha.-olefins.
    Type: Grant
    Filed: November 13, 1978
    Date of Patent: March 23, 1982
    Assignee: The Dow Chemical Company
    Inventors: Wilbur L. Bressler, Kirby Lowery, Jr., Fred L. Vance, Jr.
  • Dual, independently supported catalyst mixtures
    Patent number: 4285834
    Abstract: A catalyst mixture containing at least two independently supported catalysts, at least one of which is an inorganic halide supported titanium and/or vanadium Ziegler type catalyst and at least one other is an inorganic oxide supported, chromium catalyst.These catalyst mixtures are suitable for polymerizing one or more .alpha.-olefins.
    Type: Grant
    Filed: December 31, 1979
    Date of Patent: August 25, 1981
    Assignee: The Dow Chemical Company
    Inventors: Kirby Lowery, Jr., Fred L. Vance, Jr.
  • Polymerization of olefins with dual, independently supported catalysts
    Patent number: 4263422
    Abstract: Alpha-olefins are polymerized in the presence of at least two independently supported catalysts, one of which is an inorganic halide supported titanium and/or vanadium Ziegler type catalyst and at least one other is inorganic oxide supported, chromium catalyst. This dual catalyst increases catalyst efficiency and/or provides more flexible control of the properties of the resulting polymers.
    Type: Grant
    Filed: December 31, 1979
    Date of Patent: April 21, 1981
    Assignee: The Dow Chemical Company
    Inventors: Kirby Lowery, Jr., Fred L. Vance, Jr.
  • Polymerization of .alpha.-olefins with a dual transition metal catalyst
    Patent number: 4204050
    Abstract: .alpha.-olefins are polymerized with a catalyst prepared from (1) an inert support, (2) the reaction product of a tetravalent hydrocarbyloxy titanium halide such as di-n-butoxy titanium dichloride and hexavalent chromium oxide and (3) an organometal activating agent such as a tri alkyl aluminum.
    Type: Grant
    Filed: November 9, 1978
    Date of Patent: May 20, 1980
    Assignee: The Dow Chemical Company
    Inventors: Wilbur L. Bressler, Kirby Lowery, Jr., Fred L. Vance, Jr.