Patents by Inventor Thomas V. Edwards

Thomas V. Edwards 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).

  • Black pearlescent pigments
    Patent number: 6616745
    Abstract: A metal oxide-coated mica pearlescent pigment having a coating of copper chromite thereon is provided.
    Type: Grant
    Filed: July 17, 2002
    Date of Patent: September 9, 2003
    Assignee: Engelhard Corporation
    Inventors: Samuel F. Narvarti, Mark E. Gall, Thomas V. Edwards, Frank A. Mazzella, William L. Howell, Jr.
  • KOH neutralized metatitanic acid mixture and complex inorganic pigments containing the same
    Patent number: 6036763
    Abstract: In one embodiment, the present invention relates to a KOH neutralized metatitanic acid mixture containing from about 30% to about 99% by weight metatitanic acid, from about 1% to about 20% by weight of a titanyl compound, and optionally from about 0% to about 55% by weight titanium dioxide, wherein the KOH neutralized metatitanic acid mixture has a pH from about 4 to about 6.5. In another embodiment, the present invention relates to a pigment composition made by combining a KOH neutralized metatitanic acid mixture and at least one guest element precursor, wherein the KOH neutralized metatitanic acid mixture contains metatitanic acid, a titanyl compound, and optionally titanium dioxide, the KOH neutralized metatitanic acid mixture having a pH from about 4 to about 6.5.
    Type: Grant
    Filed: October 16, 1998
    Date of Patent: March 14, 2000
    Assignee: Engelhard Corporation
    Inventors: Thomas V. Edwards, William L. Howell, Jr., Frank A. Mazzella