Patents by Inventor Masatoki Tokunga

Masatoki Tokunga 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).

  • Magnetically anisotropic bond magnet, magnetic powder for the magnet and manufacturing method of the powder
    Patent number: 4921553
    Abstract: Magnetically anisotripic powder and resin-bonded magnets made therefrom have "flattened" crystal grains of an R-TM-B-M system alloy with preferably (c)/(a) greater than 2, where (c) is the grain size perpendicular to the C-axis and (a) the grain size parallel to the C-axis. The "flattened" grains are produced by plastically deforming a green compact of flakes formed by rapidly-quenching an alloy melt, and then crushing the plastically deformed body. In the allow system, R is at least one of the rare earth elements including Y, TM is Fe or Fe a part of which has been substituted with Co, B is boron, and M is an additive selected from Si, Al, Nb, Zr, P and C.
    Type: Grant
    Filed: March 17, 1987
    Date of Patent: May 1, 1990
    Assignee: Hitachi Metals, Ltd.
    Inventors: Masatoki Tokunga, Yasuto Nozawa, Katsunori Iwasaki