Patents by Inventor Qian Qiu Zhao

Qian Qiu Zhao 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).

  • High pressure media mill
    Patent number: 7152819
    Abstract: This invention discloses a high pressure media mill (HPMM) and processes for use thereof.
    Type: Grant
    Filed: May 22, 2002
    Date of Patent: December 26, 2006
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: William Norman Ford, Erik H. J. C. Gommeren, Qian Qiu Zhao
  • Method of preparing grinding media consisting essentially of sintered TiO.sub.2 particles
    Patent number: 6036999
    Abstract: This invention relates to methods of preparing grinding media consisting essentially of sintered titanium dioxide (TiO.sub.2) particles. The method involves preparing base TiO.sub.2 particles, coating the base TiO.sub.2 particles with at least one hydrous oxide, compressing the TiO.sub.2 particles, and granulating the TiO.sub.2 particles to form TiO.sub.2 particles having substantially rounded edges. The invention further encompasses the resulting grinding media prepared by such methods and to methods of using such grinding media in media-milling particulate material such as titanium dioxide pigments.
    Type: Grant
    Filed: July 3, 1997
    Date of Patent: March 14, 2000
    Inventors: Qian Qiu Zhao, David Allen Zimmerman