Patents by Inventor Noriyuki Chujyo

Noriyuki Chujyo 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).

  • Valve
    Patent number: 4754950
    Abstract: There is disclosed a valve comprising one valve seat ring, of a disc or a body, having a surface composed of a Cr-Mn-Fe system or a Cr-Ni-Fe system Fe-based precipitation hardening type alloy, and another valve seat ring thereof having a surface composed of a Cr-Ni system Ni-based alloy having a hardness Hv of 400 or more.The valves of this invention can have excellent wear resistance, cavitation erosion resistance and galling resistance, and since emitting no cobalt, the valves of this invention are suitable for various plants such as chemical plants, particularly nuclear power plants.
    Type: Grant
    Filed: October 29, 1985
    Date of Patent: July 5, 1988
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kaoru Tada, Mituo Kawai, Tetsuo Fujiwara, Noriyuki Chujyo, Masahiko Hasunuma, Yuji Yasuda