Patents by Inventor Larry C. Powell

Larry C. Powell 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).

  • Effective reductive bleaching of mineral slurries
    Patent number: 7648032
    Abstract: Disclosed herein are a method of reductively bleaching a mineral slurry comprising adding in the mineral slurry an effective amount of a formamidine sulfinic acid (FAS) and an effective amount of a borohydride to reductively bleach the mineral slurry, compositions comprising a mineral slurry, a FAS, and a borohydride, and final products comprising a mineral obtained by the method disclosed herein.
    Type: Grant
    Filed: March 22, 2005
    Date of Patent: January 19, 2010
    Assignee: Imerys Pigments, Inc.
    Inventors: Jun Yuan, Robert J. Pruett, Larry C. Powell