Patents by Inventor Windell R. Andrews

Windell R. Andrews 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 for beneficiating discolored kaolin to produce high brightness coating clay
    Patent number: 5685900
    Abstract: A method for beneficiating a low brightness fine particle size discolored kaolin crude to produce a high brightness coating clay. By combining the two beneficiating techniques of selective flocculation and ozonation, a synergistic phenomena occurs and a clay product of superior brightness and whiteness can be obtained from fine discolored clays that cannot be achieved by beneficiation with either process singularly. By passing the flocced clay through ozonation, the flocculant polymer left in the clay can be completely destroyed.
    Type: Grant
    Filed: October 18, 1995
    Date of Patent: November 11, 1997
    Assignee: ECC International Inc.
    Inventors: Jun Yuan, Ben E. Everett, Windell R. Andrews