Patents by Inventor Kiyoshi Isoishi

Kiyoshi Isoishi 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).

  • Fibrous anisotropic permanent magnet and production process thereof
    Patent number: 5183515
    Abstract: A fibrous anisotropic permanent magnet is disclosed comprising fibers composed of an alloy comprising at least one of a rare earth metal selected from Nd, Pr, Dy, Ho, Tb, La, and Ce; Fe or Fe and Co; and B, said fibers having a mean diameter of from 50 to 1,000 .mu.m and exhibiting magnetic anisotropy. The fibrous anisotropy permanent magnet is prepared by extruding a molten alloy comprising at least one of Nd, Pr, Dy, Ho, Tb, La, and Ce; Fe or Fe and Co; and B in an oil to quench-solidify the molten alloy into a fibrous form.Since the fibrous magnet exhibits excellent anisotropic magnetic characteristics in the lengthwise direction of the fiber axis in the quench-solidified state, the magnet is particularly useful as a magnetic powder material for an anisotropic bond magnet.
    Type: Grant
    Filed: March 31, 1992
    Date of Patent: February 2, 1993
    Assignees: Unitika Ltd., Mitsubishi Kasei Corporation
    Inventors: Shuji Ueno, Michiaki Hagiwara, Ryoji Mishima, Kiyoshi Isoishi
  • Fibrous anisotropic permanent magnet and production process thereof
    Patent number: 5135585
    Abstract: A fibrous anisotropic permanent magnet is disclosed comprising fibers composed of an alloy comprising at least one of a rare earth metal selected from Nd, Pr, Dy, Ho, Tb, La, and Ce; Fe or Fe and Co; and B, said fibers having a mean diameter of from 50 to 1,000 .mu.m and exhibiting magnetic anisotropy. The fibrous anisotropy permanent magnet is prepared by extruding a molten alloy comprising at least one of Nd, Pr, Dy, Ho, Tb, La, and Ce; Fe or Fe and Co; and B in an oil to quench-solidify the molten alloy into a fibrous form.Since the fibrous magnet exhibits excellent anisotropic magnetic characteristics in the lengthwise direction of the fiber axis in the quench-solidified state, the magnet is particularly useful as a magnetic powder material for an anisotropic bond magnet.
    Type: Grant
    Filed: November 7, 1990
    Date of Patent: August 4, 1992
    Assignees: Unitika Ltd., Mitsubishi Kasei Corporation
    Inventors: Shuji Ueno, Michiaki Hagiwara, Ryoji Mishima, Kiyoshi Isoishi