Patents by Inventor Tara G. Hill

Tara G. Hill 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).

  • Organo-aluminoxy product and use
    Patent number: 6005061
    Abstract: In accordance with the present invention there is provided a new solid aluminoxy composition prepared by reacting aluminoxane with a boroxine. Still further there is provided olefin polymerization catalyst systems incorporating the inventive solid aluminoxy composition. Still further, there is provided processes of polymerization using the inventive solid aluminoxy composition.
    Type: Grant
    Filed: January 17, 1995
    Date of Patent: December 21, 1999
    Inventors: Rolf L. Geerts, Tara G. Hill, Scott E. Kufeld
  • Silyl bridged metallocenes and use thereof
    Patent number: 5627118
    Abstract: Fluorenyl-containing silyl bridged metallocenes, the process of using such metallocenes to polymerize olefins, and the resulting unusual syndiotactic polypropylene are disclosed.
    Type: Grant
    Filed: December 9, 1994
    Date of Patent: May 6, 1997
    Assignee: Phillips Petroleum Company
    Inventors: Syriac J. Palackal, Helmut G. Alt, Konstantinos Patsidis, Tara G. Hill, Gil R. Hawley, Peter P. Chu, M. Bruce Welch, Rolf L. Geerts
  • Syndiotactic polypropylene prepared using silyl bridged metallocenes
    Patent number: 5459218
    Abstract: Fluorenyl-containing silyl bridged metallocenes, the process of using such metallocenes to polymerize olefins, and the resulting unusual syndiotactic polypropylene are disclosed.
    Type: Grant
    Filed: December 9, 1994
    Date of Patent: October 17, 1995
    Assignee: Phillips Petroleum Company
    Inventors: Syriac J. Palackal, Helmut G. Alt, Konstantinos Patsidis, Tara G. Hill, Gil R. Hawley, Peter P. Chu, M. Bruce Welch, Rolf L. Geerts
  • Organo-aluminoxy product and use
    Patent number: 5414180
    Abstract: Organic aluminoxy compounds are prepared by reacting an organo boronic acid with a trihydrocarbyl aluminum compound. The resulting products are suitable as components for catalyst systems for the polymerization of olefins.
    Type: Grant
    Filed: July 14, 1993
    Date of Patent: May 9, 1995
    Assignee: Phillips Petroleum Company
    Inventors: Rolf L. Geerts, Tara G. Hill
  • Organo-aluminoxy product and use
    Patent number: 5411925
    Abstract: In accordance with the present invention there is provided a new solid aluminoxy composition prepared by reacting aluminoxane with a boroxine. Still further there is provided olefin polymerization catalyst systems incorporating the inventive solid aluminoxy composition. Still further, there is provided processes of polymerization using the inventive solid aluminoxy composition.
    Type: Grant
    Filed: February 12, 1993
    Date of Patent: May 2, 1995
    Assignee: Phillips Petroleum Company
    Inventors: Rolf L. Geerts, Scott E. Kufeld, Tara G. Hill
  • Olefin polymerization using silyl-bridged metallocenes
    Patent number: 5401817
    Abstract: Fluorenyl-containing silyl bridged metallocenes, the process of using such metallocenes to polymerize olefins, and the resulting unusual syndiotactic polypropylene are disclosed.
    Type: Grant
    Filed: May 20, 1993
    Date of Patent: March 28, 1995
    Assignee: Phillips Petroleum Company
    Inventors: Syriac J. Palackal, Helmut G. Alt, Konstantinos Patsidis, Tara G. Hill, Gil R. Hawley, Peter P. Chu, M. Bruce Welch, Rolf L. Geerts