Patents by Inventor James D. Schreck

James D. Schreck 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).

  • Olefin polymerization catalyst
    Patent number: 6320002
    Abstract: This invention relates to a process to polymerize olefins comprising contacting an olefin with a composition comprising the product of the combination of an activator and a transition metal compound provided that if the process occurs in the slurry phase then the activator and the transition metal compound are allowed to react for at least fifteen minutes before being contacted with the olefin.
    Type: Grant
    Filed: December 18, 1998
    Date of Patent: November 20, 2001
    Assignee: Univation Technologies, LLC
    Inventors: Rex E. Murray, Simon Mawson, Clark C. Williams, James D. Schreck
  • Polyolefin
    Patent number: 6265513
    Abstract: Polyolefin wherein A) the melt indices of Fractions 1, 4 and 6 of the polyolefin do not vary by more than 20% relative to the mean of Fractions 1, 4 and 6; and/or B) the percent crystallinity of Fractions 1, 4 and 6 of the polyolefin do not vary by more than 6% relative to the mean of Fractions 1, 4 and 6; and/or C) the Mw/Mn of Fractions 1, 4 and 6 of the polyolefin do not vary by more than 20% relative to the mean of Fractions 1, 4 and 6; and/or D) Fraction 1 has an aspect ratio of 0.5-1.5, fraction 4 has an aspect ratio of 1.2 to 4, Fraction 6 has an aspect ratio of about 1.75 to 5 provided that the aspect ratios of the Fractions differ by at least 0.
    Type: Grant
    Filed: December 18, 1998
    Date of Patent: July 24, 2001
    Assignee: Univation Technologies, LLC
    Inventors: Rex E. Murray, Simon Mawson, Clark C. Williams, James D. Schreck