Patents by Inventor Bobbi Leigh Liebrecht

Bobbi Leigh Liebrecht 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).

  • On the fly catalyst transitions
    Patent number: 7741414
    Abstract: A process for transitioning between Ziegler Natta (Z/N) polymerization catalysts and Second Polymerization catalysts in a polymerization system which includes at least two polymerization reactors. During the transition, the Z/N catalyst is used in the “downstream” reactor, thereby providing a flow of polymer to finishing operations. This eliminates the need for lengthy shutdowns of finishing equipment and thereby improves the efficiency of the plant operations.
    Type: Grant
    Filed: November 22, 2006
    Date of Patent: June 22, 2010
    Assignee: Nova Chemicals (International) S.A.
    Inventors: Stephen John Brown, Kenneth Edward Taylor, Bobbi Leigh Liebrecht