Patents by Inventor Phillip J. Griffith

Phillip J. Griffith 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).

  • Method of preparing hydrophobic precipitated silica
    Patent number: 5908660
    Abstract: A method for the preparation of hydrophobic precipitated silicas which are useful, for example, as reinforcing fillers in rubber compositions. The method comprises two steps, where in the first step an aqueous suspension of precipitated silica is contacted with an organosilicon compound in the presence of a catalytic amount of an acid to effect hydrophobing of the precipitated silica. In the second step the aqueous suspension of the hydrophobic precipitated silica is contacted with a water-immiscible organic solvent at a solvent to silica weight ratio greater than 5:1 to effect separation of the hydrophobic precipitated silica from the aqueous phase.
    Type: Grant
    Filed: September 3, 1997
    Date of Patent: June 1, 1999
    Assignee: Dow Corning Corporation
    Inventors: Phillip J. Griffith, Brian R. Harkness, William Herron, Rosemary M. Taylor, David J. Wilson