Patents by Inventor Zenichi Yamada

Zenichi Yamada 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).

  • Silica gel carrying titanium oxide photocatalyst
    Patent number: 6632771
    Abstract: The silica gel carrying a titanium oxide photocatalyst in a high concentration of the present invention is characterized in that the concentration of the titanium oxide contained in the pores near the surface of the silica gel is 7-70% by weight, said silica gel having an average pore diameter of 6-100 nm, provided that the concentration gradient is provided such that the amount of the titanium oxide contained in the pores near the surface of the silica gel is 1.5 times or more than the amount of the titanium oxide contained in the pores near the central part of the silica gel.
    Type: Grant
    Filed: July 27, 2001
    Date of Patent: October 14, 2003
    Assignee: Sintokogio Ltd.
    Inventors: Masaaki Maekawa, Chisako Shirai, Satoshi Takeuchi, Zenichi Yamada