Patents by Inventor Mark Jay Ziebart

Mark Jay Ziebart 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).

  • Increased run length in gas phase reactors
    Patent number: 8450435
    Abstract: The time between shut downs of a gas phase reactor for the polymerization of polyethylene may be significantly increased if the catalyst used is not prepared by impregnating the support with a solution of catalyst in an electron donor; the reaction is controlled using the addition of activator based on polymer production rate and the recycle stream contains a condensed liquid phase in an amount greater than 13 weight %. Operating the reactor in this manner increase the time between cleaning the cooler (heat exchanger) the bed plate, or both from about 4 to 6 months to not less than about 24 months.
    Type: Grant
    Filed: June 6, 2011
    Date of Patent: May 28, 2013
    Assignee: NOVA Chemicals (International) S.A
    Inventors: John Iatrou, Mark Jay Ziebart, Dale Warren Nagel, Kent Gray Jensen, Benjamin Milton Shaw
  • Increased run length in gas phase reactors
    Publication number: 20110301308
    Abstract: The time between shut downs of a gas phase reactor for the polymerization of polyethylene may be significantly increased if the catalyst used is not prepared by impregnating the support with a solution of catalyst in an electron donor; the reaction is controlled using the addition of activator based on polymer production rate and the recycle stream contains a condensed liquid phase in an amount greater than 13 weight %. Operating the reactor in this manner increase the time between cleaning the cooler (heat exchanger) the bed plate, or both from about 4 to 6 months to not less than about 24 months.
    Type: Application
    Filed: June 6, 2011
    Publication date: December 8, 2011
    Inventors: John Iatrou, Mark Jay Ziebart, Dale Warren Nagel, Kent Gray Jensen, Benjamin Milton Shaw