Patents by Inventor Philip Chegwidden

Philip Chegwidden 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).

  • Coated titanium dioxide pigments and processes for production and use
    Patent number: 6342099
    Abstract: The present invention provides a coated titanium dioxide pigment which includes a base titanium dioxide pigment; a first deposit of a phosphate compound contiguous with the base titanium dioxide pigment; a deposit of a silica or zirconia compound contiguous with the phosphate deposit; a second deposit of a phosphate compound contiguous with the silica or zirconia compound; and a deposit of an alumina compound contiguous with the second phosphate deposit. Titanium dioxide pigments of the present invention are easily dispersible, and display excellent durability and gloss.
    Type: Grant
    Filed: September 15, 2000
    Date of Patent: January 29, 2002
    Assignee: Millennium Inorganic Chemicals, Inc.
    Inventors: Michael Hiew, Philip Chegwidden