Patents by Inventor William J. Graff

William J. Graff 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).

  • Pelletizing aid for manufacturing polyolefins
    Patent number: 5206292
    Abstract: A method for substantially minimizing the agglomeration of freshly manufactured polyolefin pellets, comprising adding an effective amount of oxidized high density polyethylene powder during the manufacturing process. The method results in the production of more commercially desirable non-agglomerated polyolefin pellets.
    Type: Grant
    Filed: May 28, 1992
    Date of Patent: April 27, 1993
    Assignee: Shell Oil Company
    Inventors: Charles C. Hwo, William J. Graff
  • Polymer blends
    Patent number: H1253
    Abstract: Polymer blends of improved properties for use in packaging applications comprise blends of a crystalline poly(1-butene) and a selectively hydrogenated block copolymer of vinyl aromatic hydrocarbon and conjugated alkadiene of the SEBS type.
    Type: Grant
    Filed: November 18, 1991
    Date of Patent: November 2, 1993
    Assignee: Shell Oil Company
    Inventors: Charles C. Hwo, Jerry W. Secrist, William J. Graff