Patents by Inventor Okai Kazuhisa

Okai Kazuhisa 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).

  • Surface-treated steel sheets of good white rust resistance, and method for producing them
    Patent number: 7291402
    Abstract: The invention is to provide a surface-treated steel sheet of good white rust resistance with no chromium in its surface treatment film, and it has realized a surface-treated steel sheet of higher-level corrosion resistance by forming a reaction layer of plating metal with a barrier layer effective for anticorrosion not in a two-layered film but in a single-layered film.
    Type: Grant
    Filed: February 14, 2003
    Date of Patent: November 6, 2007
    Assignees: JFE Steel Corporation, Kansai Paint Co., Ltd.
    Inventors: Okai Kazuhisa, Akira Matsuzaki, Naoto Yoshimi, Takahiro Kubota, Masaaki Yamashita, Hisato Noro, Haruo Nakamichi, Kaoru Sato, Hiroyasu Matsuki, Reijiro Nishida, Masahiro Murata, Shoichi Tanaka, Yoshikazu Morohoshi, Shingo Amaki