Patents by Inventor Satoshi Hirosawa

Satoshi Hirosawa 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).

  • Rare earth magnet having excellent corrosion resistance
    Patent number: 5167914
    Abstract: An (Fe, Co)-B-R tetragonal type magnet having a high corrosion resistance, which has a boundary phase stabilized by Co and Al against corrosion, and which consists essentially of:0.2-3.0 at % Dy and 12-17 at % of the sum of Nd and Dy;5-10 at % B;0.5-13 at % Co;0.5-4 at % Al; andthe balance being at least 65 at % Fe.0.1-1.0 at % of Ti and/or Nb may be present. Alloy powders therefor can be also stabilized.
    Type: Grant
    Filed: May 22, 1991
    Date of Patent: December 1, 1992
    Assignee: Sumitomo Special Metals Co., Ltd.
    Inventors: Setsuo Fujimura, Masato Sagawa, Hitoshi Yamamoto, Satoshi Hirosawa