Patents by Inventor Yusuke Isobe

Yusuke Isobe 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).

  • Method of evaluating corrosion resistance of metal material, method of designing alloy of high corrosion resistance, method of diagnosing corroded state of metal material, and method of operating plant
    Patent number: 5901071
    Abstract: The composition of an alloy is inhomogeneous, so that the Fermi level of electrons in the surface of the alloy differs depending upon positions. It is accordingly considered that a part susceptible to corrosion and a part less susceptible thereto will coexist in the alloy. The corrosion rate of the alloy is indicated as the exponential function of a potential difference (.DELTA..PHI..sub.H) within an electric double layer. The potential difference remains unchanged as long as the Fermi level lies within the forbidden band of the electrons. However, in a range in which the Fermi level falls within the valence band of the electrons, the lowering thereof leads to the increase of the potential difference.
    Type: Grant
    Filed: June 28, 1995
    Date of Patent: May 4, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Masanori Sakai, Noriyuki Ohnaka, Yuichi Ishikawa, Haruo Fujimori, Yusuke Isobe, Takuya Takahashi