Patents by Inventor Gene H. C. Yeh

Gene H. C. Yeh 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).

  • Pelletizing polymers
    Patent number: 4923649
    Abstract: A method of pelletizing polymer utilizing a liquid medium characterized in that the liquid medium boils at a temperature greater than the melting temperature of the polymer and is immiscible with the molten polymer so that (1) polymer can be heated in the liquid medium to a temperature that causes particulates to melt, (2) the melted polymer can be allowed to agglomerate and (3) the agglomerated polymer can be cooled in a liquid to form pellets.
    Type: Grant
    Filed: March 6, 1986
    Date of Patent: May 8, 1990
    Assignee: Phillips Petroleum Company
    Inventors: Eric T. Hsieh, Gene H. C. Yeh, John R. Donaldson
  • Olefin polymerization
    Patent number: 4791086
    Abstract: A process for producing a novel-highly active lanthanide containing catalyst comprising the product produced by reacting a lanthanide hydride, a Lewis acid, and an electron donor ligand with an organoaluminum cocatalyst component and its use in the polymerization of olefins, especially olefins such as ethylene and 1,3-butadiene.
    Type: Grant
    Filed: July 1, 1987
    Date of Patent: December 13, 1988
    Assignee: Phillips Petroleum Company
    Inventors: Gene H. C. Yeh, Henry L. Hsieh
  • Olefin polymerization
    Patent number: 4699962
    Abstract: A process for producing a novel-highly active lanthanide containing catalyst comprising the product produced by reacting a lanthanide hydride, a Lewis acid, and an electron donor ligand with an organoaluminum cocatalyst component and its use in the polymerization of olefins, especially olefins such as ethylene and 1,3-butadiene.
    Type: Grant
    Filed: January 30, 1984
    Date of Patent: October 13, 1987
    Assignee: Phillips Petroleum Company
    Inventors: Henry L. Hsieh, Gene H. C. Yeh
  • Olefin polymerization
    Patent number: 4575538
    Abstract: A process for producing a novel-highly active lanthanide containing catalysts comprising products formed by reacting a lanthanide halide, and an electron doner ligand with an organometal cocatalyst component and its use in the polymerization of olefins, especially olefins such as ethylene, 1,3-butadiene, isoprene and the like. In one embodiment, an organic base is used to increase catalyst activity in those instances where rare earth metal halide-ligand complex is formed with a ligand containing an acidic proton. In another embodiment, diolefins and vinyl aromatics are polymerized in a two-stage process employing a lanthanide complex-organometal cocatalyst in the first stage and a free radical initiator in the second stage.
    Type: Grant
    Filed: December 20, 1984
    Date of Patent: March 11, 1986
    Assignee: Phillips Petroleum Company
    Inventors: Henry L. Hsieh, Gene H. C. Yeh
  • Olefin polymerization
    Patent number: 4556647
    Abstract: A process for producing a novel-highly active lanthanide containing catalyst comprising the product formed by admixing a lanthanide hydroxyhalide and an electron donor bidentate organic ligand chosen from among diamines, dihydric alcohols, and diketones with an organoaluminum cocatalyst component and its use in the polymerization of olefins, especially olefins such as ethylene and 1,3-butadiene.
    Type: Grant
    Filed: February 25, 1985
    Date of Patent: December 3, 1985
    Assignee: Phillips Petroleum Company
    Inventors: Gene H. C. Yeh, Joel L. Martin, Henry L. Hsieh
  • Olefin polymerization
    Patent number: 4544718
    Abstract: A process for producing a novel-highly active lanthanide containing catalyst comprising the product formed by admixing a lanthanide hydroxyhalide and an electron donor bidentate organic ligand chosen from among diamines, dihydric alcohols, and diketones with an organoaluminum cocatalyst component and its use in the polymerization of olefins, especially olefins such as ethylene and 1,3-butadiene.
    Type: Grant
    Filed: September 13, 1984
    Date of Patent: October 1, 1985
    Assignee: Phillips Petroleum Company
    Inventors: Gene H. C. Yeh, Joel L. Martin, Henry L. Hsieh