Patents by Inventor Douglas D. Keller

Douglas D. Keller 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).

  • Polyethylene composition having reduced warpage in molded articles
    Patent number: 8207248
    Abstract: Disclosed is a colored high density polyethylene composition. The composition comprises a high density polyethylene, phthalocyanine blue, and talc. The composition exhibits reduced warpage in molded articles compared to those which do not contain talc. The composition is useful for injection molding and many other applications where a blue color is needed and low warpage is desired.
    Type: Grant
    Filed: February 17, 2010
    Date of Patent: June 26, 2012
    Assignee: Equistar Chemicals, LP
    Inventors: Jeffrey C. Haley, Robert L. Sherman, Jr., Edward S. Vargas, Douglas D. Keller, Jeffrey J. Strebel
  • Polyethylene composition having reduced warpage in molded articles
    Publication number: 20110201729
    Abstract: Disclosed is a colored high density polyethylene composition. The composition comprises a high density polyethylene, phthalocyanine blue, and talc. The composition exhibits reduced warpage in molded articles compared to those which do not contain talc. The composition is useful for injection molding and many other applications where a blue color is needed and low warpage is desired.
    Type: Application
    Filed: February 17, 2010
    Publication date: August 18, 2011
    Inventors: Jeffrey C. Haley, Robert L. Sherman, JR., Edward S. Vargas, Douglas D. Keller, Jeffrey J. Strebel
  • Propylene polymer compositions having improved color and stabilizers therefor.
    Patent number: 5574082
    Abstract: Useful stabilizer combinations and propylene polymer compositions stabilized therewith having improved resistance to discoloration upon processing are provided. The stabilizer combinations of the invention are comprised of a mixture of calcium salts of stearic acid and lactic acid and a tocopherol-containing mixture consisting essentially of .alpha.-tocopherol, glycerin, polyethylene glycol having an average molecular weight of about 300 and glycerol monocaprylate. Propylene homopolymers and random, block and impact copolymers of propylene are stabilized in accordance with the invention.
    Type: Grant
    Filed: May 25, 1995
    Date of Patent: November 12, 1996
    Assignee: Quantum Chemical Company
    Inventors: Douglas D. Keller, Morgan L. Gibbs