Patents by Inventor Wesley J. Robertson

Wesley J. Robertson 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).

  • Oxygen tailoring of polyethylene film resins
    Patent number: 6989423
    Abstract: Processes are disclosed for oxygen-tailoring polyethylene resin. Polyethylene resin is conveyed through a feed zone, a melt-mixing zone and a melt zone. The resin is contacted with oxygen in an amount of at least 40 parts by weight O2 per million parts by weight resin, and contacted with primary antioxidant downstream of the point or points of oxygen contact. The oxygen-treated resin can be used to make polyethylene film having improved gauge uniformity.
    Type: Grant
    Filed: July 2, 2003
    Date of Patent: January 24, 2006
    Assignee: ExxonMobil Chemical Patents, Inc.
    Inventors: James E. Wagner, Jerry M. Johnson, Dale J. Joy, Wesley J. Robertson, Timothy J. Cowell
  • Method of processing polyethylene resins
    Patent number: 6924351
    Abstract: Process for pelletizing polyethylene resin are disclosed, the processes providing pelletized resin having reduced occurrence of defects such as black specks. Polyethylene resin is conveyed in a downstream direction through a mixer having a feed zone, a melt-mixing zone downstream of the feed zone, and a melt-conveying zone downstream of the melt-mixing zone; contacted with nitrogen gas in the melt-conveying zone; and conveyed through a mixer discharge to form pellets. Also disclosed are processes of forming films from such resins, the films having reduced occurrence of gels, and articles such as blow molded or injection molded articles.
    Type: Grant
    Filed: June 11, 2003
    Date of Patent: August 2, 2005
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Tomasz J. Gralinski, Thomas R. Rios, Carl Dean Heard, W. Bing Kao, Joanne K. Pabst, Wesley J. Robertson, Joel E. Schmieg
  • Oxygen tailoring of polyethylene film resins
    Publication number: 20040039131
    Abstract: Processes are disclosed for oxygen-tailoring polyethylene resin. Polyethylene resin is conveyed through a feed zone, a melt-mixing zone and a melt zone. The resin is contacted with oxygen in an amount of at least 40 parts by weight O2 per million parts by weight resin, and contacted with primary antioxidant downstream of the point or points of oxygen contact. The oxygen-treated resin can be used to make polyethylene film having improved gauge uniformity.
    Type: Application
    Filed: July 2, 2003
    Publication date: February 26, 2004
    Inventors: James E. Wagner, Jerry M. Johnson, Dale J. Joy, Wesley J. Robertson, Timothy J. Cowell
  • Method of processing polyethylene resins
    Publication number: 20030230820
    Abstract: Process for pelletizing polyethylene resin are disclosed, the processes providing pelletized resin having reduced occurrence of defects such as black specks. Polyethylene resin is conveyed in a downstream direction through a mixer having a feed zone, a melt-mixing zone downstream of the feed zone, and a melt-conveying zone downstream of the melt-mixing zone; contacted with nitrogen gas in the melt-conveying zone; and conveyed through a mixer discharge to form pellets. Also disclosed are processes of forming films from such resins, the films having reduced occurrence of gels, and articles such as blow molded or injection molded articles.
    Type: Application
    Filed: June 11, 2003
    Publication date: December 18, 2003
    Inventors: Tomasz J. Gralinski, Thomas R. Rios, Carl Dean Heard, W. Bing Kao, Joanne K. Pabst, Wesley J. Robertson, Joel E. Schmieg