Patents by Inventor Patrick Drew Evans

Patrick Drew Evans 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).

  • Chromium catalysts for olefin polymerization
    Patent number: 9593187
    Abstract: Mineral oil is added to a supported chromium catalyst in amounts which maintain a free flowing particulate material. Chromium catalysts so treated, provide polyethylene in a gas phase ethylene polymerization process with reduced reactor fouling or static.
    Type: Grant
    Filed: July 25, 2014
    Date of Patent: March 14, 2017
    Assignee: NOVA Chemicals (International) S.A.
    Inventors: Xiaoliang Gao, Patrick Drew Evans
  • CHROMIUM CATALYSTS FOR OLEFIN POLYMERIZATION
    Publication number: 20140336342
    Abstract: Mineral oil is added to a supported chromium catalyst in amounts which maintain a free flowing particulate material. Chromium catalysts so treated, provide polyethylene in a gas phase ethylene polymerization process with reduced reactor fouling or static.
    Type: Application
    Filed: July 25, 2014
    Publication date: November 13, 2014
    Applicant: NOVA CHEMICALS (INTERNATIONAL) S.A.
    Inventors: Xiaoliang Gao, Patrick Drew Evans
  • Chromium catalysts for olefin polymerization
    Patent number: 8846834
    Abstract: Mineral oil is added to a supported chromium catalyst in amounts which maintain a free flowing particulate material. Chromium catalysts so treated, provide polyethylene in a gas phase ethylene polymerization process with reduced reactor fouling or static.
    Type: Grant
    Filed: April 30, 2012
    Date of Patent: September 30, 2014
    Assignee: NOVA Chemicals (International) S.A.
    Inventors: Xiaoliang Gao, Patrick Drew Evans
  • CHROMIUM CATALYSTS FOR OLEFIN POLYMERIZATION
    Publication number: 20120302707
    Abstract: Mineral oil is added to a supported chromium catalyst in amounts which maintain a free flowing particulate material. Chromium catalysts so treated, provide polyethylene in a gas phase ethylene polymerization process with reduced reactor fouling or static.
    Type: Application
    Filed: April 30, 2012
    Publication date: November 29, 2012
    Applicant: NOVA CHEMICALS (INTERNATIONAL) S.A.
    Inventors: Xiaoliang Gao, Patrick Drew Evans