Patents by Inventor Dale E. Pierce

Dale E. Pierce 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).

  • Olefin polymerization
    Patent number: 5179178
    Abstract: A process for polymerizing olefins wherin a suitable amount of a fumed refractory oxide is used to improve the flow of particulate catalyst as a slurry of that catalyst is charged to the polymerization zone.
    Type: Grant
    Filed: May 15, 1992
    Date of Patent: January 12, 1993
    Assignee: Phillips Petroleum Company
    Inventors: Elizabeth M. Stacy, M. Bruce Welch, Shirley J. Martin, Max P. McDaniel, Dale E. Pierce
  • Polyolefin polymerization process and catalyst
    Patent number: 4588703
    Abstract: An olefin polymerization catalyst prepared by reacting a metal dihalide and a transition metal, then reacting that component with a precipitating agent, and then reacting the resulting solid with an activating component, wherein multiple activation steps are used so that it is possible to obtain a given level of activity with less activating component.
    Type: Grant
    Filed: July 18, 1984
    Date of Patent: May 13, 1986
    Assignee: Phillips Petroleum Company
    Inventors: Kiplin D. Cowan, Dale E. Pierce, Oscar D. Nowlin
  • Process for the preparation of an olefin polymerization catalyst
    Patent number: 4585749
    Abstract: An olefin polymerization catalyst prepared by reacting an admixture of anhydrous magnesium dihalide and hydrous magnesium dihalide with reactants including benzoic acid ester, an alkoxytitanium compound, an organoaluminum halide, and a titanium halide.
    Type: Grant
    Filed: September 28, 1983
    Date of Patent: April 29, 1986
    Assignee: Phillips Petroleum Company
    Inventors: Dale E. Pierce, Jerry L. Vaughan, Oscar D. Nowlin