Patents by Inventor Veronica L. Chambers

Veronica L. Chambers 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).

  • Preparation of yellow pigments
    Patent number: 7115164
    Abstract: A process for the manufacture of a transparent Pigment Yellow 155 or transparent Pigment Yellow 180 is disclosed, said process includes grinding particles of said pigment in the presence of a grinding agent until said particles achieve a surface area of at least about 40 m2/g.
    Type: Grant
    Filed: February 28, 2005
    Date of Patent: October 3, 2006
    Assignee: Sun Chemical Corporation
    Inventors: George H. Robertson, Edward H. Sung, Veronica L. Chambers
  • Polyphosphoric acid swelling of organic pigments
    Patent number: 6537362
    Abstract: A method of conditioning an organic crude pigment by treating, under high shear, 1 part by weight of the crude pigment and about 0.5 to 1.9 parts by weight of polyphosphoric acid or polyphosphoric acid methyl ester at a temperature ranging from about 90 to 160° C.
    Type: Grant
    Filed: November 10, 2000
    Date of Patent: March 25, 2003
    Assignee: Sun Chemical Corporation
    Inventors: Edward H. Sung, Humberto Velasquez, George H. Roberston, Veronica L. Chambers