Patents by Inventor Katsutoshi Hashima

Katsutoshi Hashima 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).

  • Steel for chimney or gas duct, excellent in pitting resistance and rust adhesion
    Patent number: 5820819
    Abstract: The present invention has an object to provide a steel for a chimney or a gas duct, which is excellent in pitting resistance and rust adhesion in a corrosive environment caused by combustion waste gas in a plant in which the combustion of natural gas occurs. Pitting resistance and rust adhesion are remarkably improved in the steel of the present invention which steel is prepared by using a 5% Cr steel as the base, while reducing an impurity sulfur to not more than 0.010 wt. %, adding titanium within a range of 0.005 to 0.05 wt. %, and further adding nickel alone within a range of 1.0 to 2.5 wt. %, or adding molybdenum alone within a range of 0.10 to 1.0 wt. %, or adding in combination therewith trace amount of copper or molybdenum within a range of 0.10 to 1.0 wt. %.
    Type: Grant
    Filed: August 20, 1996
    Date of Patent: October 13, 1998
    Assignees: Nippon Steel Corporation, Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Koji Tanabe, Hidesato Mabuchi, Yukio Tomita, Akira Usami, Katsutoshi Hashima, Hiroshi Kondo, Ryuichiro Ebara, Yoshikazu Yamada, Kazuhide Yamauchi, Masuo Matsumoto