Patents by Inventor Everett O. Lewis

Everett O. Lewis 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).

  • BIMODAL POLYETHYLENE PROCESS AND PRODUCTS
    Publication number: 20120123067
    Abstract: Bimodal polyethylene resins having reduced long-chain branching and suitable for use in pipe resin applications as a result of their improved SCG and RCP resistance are provided. The improved resins of the invention are produced in a two-reactor cascade slurry polymerization process using a Ziegler-Natta catalyst system and wherein an alkoxysilane modifier is present in both reactors.
    Type: Application
    Filed: January 26, 2012
    Publication date: May 17, 2012
    Inventors: Sameer D. MEHTA, Mark K. Reinking, Sebastian Joseph, Philip J. Garrison, Everett O. Lewis, Thomas J. Schwab, Wallace W. Yau
  • Olefin polymerization process
    Patent number: 7723451
    Abstract: A slurry process for polymerizing ethylene is disclosed. The process comprises polymerizing ethylene in the presence of an ?-olefin, hydrogen, and a catalyst comprising an activator and a supported, dimethylsilyl-bridged bis(indenoindolyl)zirconium complex. The process has high catalyst activity and produces polyethylene having a broad molecular weight distribution.
    Type: Grant
    Filed: September 4, 2007
    Date of Patent: May 25, 2010
    Assignee: Equistar Chemicals, LP
    Inventors: Sandor Nagy, Barbara M. Tsuie, Bradley P. Etherton, Jean A. Merrick-Mack, Everett O. Lewis, Mark P. Mack, Natalia Nagy, Edward S. Vargas
  • Bimodal polyethylene process and products
    Publication number: 20090304966
    Abstract: Bimodal polyethylene resins having reduced long-chain branching and suitable for use in pipe resin applications as a result of their improved SCG and RCP resistance are provided. The improved resins of the invention are produced in a two-reactor cascade slurry polymerization process using a Ziegler-Natta catalyst system and wherein an alkoxysilane modifier is present in both reactors.
    Type: Application
    Filed: June 5, 2008
    Publication date: December 10, 2009
    Inventors: Sameer D. Mehta, Mark K. Reinking, Sebastian Joseph, Philip J. Garrison, Everett O. Lewis, Thomas J. Schwab, Wallace W. Yau
  • Olefin polymerization process
    Publication number: 20090062490
    Abstract: A slurry process for polymerizing ethylene is disclosed. The process comprises polymerizing ethylene in the presence of an ?-olefin, hydrogen, and a catalyst comprising an activator and a supported, dimethylsilyl-bridged bis(indenoindolyl)zirconium complex. The process has high catalyst activity and produces polyethylene having a broad molecular weight distribution.
    Type: Application
    Filed: September 4, 2007
    Publication date: March 5, 2009
    Inventors: Sandor Nagy, Barbara M. Tsuie, Bradley P. Etherton, Jean A. Merrick-Mack, Everett O. Lewis, Mark P. Mack, Natalia Nagy, Edward S. Vargas
  • Polyethylene process
    Patent number: 7423098
    Abstract: An ethylene polymerization process is disclosed. Ethylene is polymerized in two slurry reaction zones with a C6-C10 alpha-olefin in the presence of a single-site catalyst capable of making a high molecular weight polyolefin. The process yields medium density and linear low density polyethylene having a bimodal molecular weight distribution and a melt index from about 0.10 to about 0.80. Films from the polyethylene have superior impact properties.
    Type: Grant
    Filed: January 17, 2006
    Date of Patent: September 9, 2008
    Assignee: Equistar Chemicals, LP
    Inventors: Philip J. Garrison, Charles S. Holland, Mark P. Mack, Linda N. Winslow, Everett O. Lewis, James R. Clark, Leonard V. Cribbs, Bradley P. Etherton, Jean A. Merrick-Mack, Paula L. Nygard