Patents by Inventor Mark C. Douglass

Mark C. Douglass 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).

  • Patent number: 7902325
    Abstract: Polymerization processes are described herein. The polymerization processes generally include introducing a catalyst system to a reaction zone, introducing an olefin monomer to the reaction zone, contacting the olefin monomer with the catalyst system to form a polyolefin and contacting the polyolefin with a quench agent, wherein the quench agent is at least partially soluble in the olefin monomer.
    Type: Grant
    Filed: June 22, 2006
    Date of Patent: March 8, 2011
    Assignee: Fina Technology, Inc.
    Inventors: Kenneth P. Blackmon, Mark C. Douglass, Kevin P. McGovern, Mark Miller, Joseph D. Thorman
  • Patent number: 7053163
    Abstract: The tendency of copolymer fluff grains of propylene and ethylene to agglomerate is reduced by injecting at least one olefin comonomer, such as ethylene monomer, into more than one point along the length of the reactor, rather than injecting all of the ethylene at one point. This process reduces the tendency of copolymer fluff grains to agglomerate and cause processing problems as compared with injecting the comonomer at only one point. Copolymer made by this process is expected to have lower substantially amorphous polypropylene content and better organoleptics than copolymer made where the ethylene is injected at only one point. In one non-limiting embodiment the copolymerization reactor is a loop-type reactor.
    Type: Grant
    Filed: February 22, 2005
    Date of Patent: May 30, 2006
    Assignee: Fina Technology, Inc.
    Inventors: Jun Tian, David Rauscher, William Gauthier, Mark C. Douglass, Nelson Black, Ronald Tharappel