Patents by Inventor John Iatrou

John Iatrou 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
  • Polymerization process using a dual shear mixing element
    Patent number: 6319996
    Abstract: A dual shear mixing element for use in a chemical reactor. The device may be used in processes where liquids of different temperatures need to be thoroughly mixed in a short period of time and solute must stay in solution. The present invention is particularly useful in the solution polymerization of polyolefins, especially in the medium pressure process for the preparation of linear low density polyethylene.
    Type: Grant
    Filed: November 12, 1999
    Date of Patent: November 20, 2001
    Assignee: Nova Chemical (International) S.A.
    Inventors: Annette Lynn Burke, Edward Christopher Foy, John Iatrou, Umesh Karnik, Darwin Edward Kiel, Vaclav George Zboril
  • Mixing element for a chemical reactor
    Patent number: 6024483
    Abstract: A dual shear mixing element includes an auger and an impeller for use in a chemical reactor. The device may be used in processes where liquids of different temperatures need to be thoroughly mixed in a short period of time and solute must stay in solution. The present invention is particularly useful in the solution polymerization of polyolefins, especially in the medium pressure process for the preparation of linear low density polyethylene.
    Type: Grant
    Filed: March 26, 1998
    Date of Patent: February 15, 2000
    Assignee: Nova Chemicals (International) S.A.
    Inventors: Annette Lynn Burke, Edward Christopher Foy, John Iatrou, Umesh Karnik, Darwin Edward Kiel, Vaclav George Zboril