Patents by Inventor Tsunehiro Yamaji

Tsunehiro Yamaji 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).

  • Silicon steel sheet and method for producing the same
    Patent number: 6527876
    Abstract: A silicon steel sheet having low iron loss of high frequency has a surface layer of the steel sheet which has Si concentration higher than Si concentration of a center portion of the steel sheet. Si concentration of sheet thickness center is 3.4 wt. % or more and Si concentration of the surface layer of the steel sheet is 5 wt. % or more. Si concentration in a surface layer portion is 5 to 8 wt. %. The production method comprises siliconizing treatment and diffusing treatment. Velocity of siliconizing and diffusing are controlled, and Si concentration distribution in the sheet thickness direction of the steel sheet is controlled.
    Type: Grant
    Filed: January 24, 2000
    Date of Patent: March 4, 2003
    Assignee: NKK Corporation
    Inventors: Misao Namikawa, Yoshikazu Takada, Shoji Kasai, Hironori Ninomiya, Tsunehiro Yamaji, Tatsuhiko Hiratani
  • SILICON STEEL SHEET AND METHOD FOR PRODUCING THE SAME
    Publication number: 20020134466
    Abstract: A silicon steel sheet having low iron loss of high frequency has a surface layer of the steel sheet which has Si concentration higher than Si concentration of a center portion of the steel sheet. Si concentration of sheet thickness center is 3.4 wt. % or more and Si concentration of the surface layer of the steel sheet is 5 wt. % or more. Si concentration in a surface layer portion is 5 to 8 wt. %. The production method comprises siliconizing treatment and diffusing treatment. Velocity of siliconizing and diffusing are controlled, and Si concentration distribution in the sheet thickness direction of the steel sheet is controlled.
    Type: Application
    Filed: January 24, 2000
    Publication date: September 26, 2002
    Inventors: MISAO NAMIKAWA, YOSHIKAZU TAKADA, SHOJI KASAI, HIRONORI NINOMIYA, TSUNEHIRO YAMAJI, TATSUHIKO HIRATANI