Patents by Inventor Takahiro Sunaga

Takahiro Sunaga 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).

  • Radial anisotropic cylinder type ferrite magnets and their manufacturing methods and motors
    Patent number: 5506557
    Abstract: A high performance radial anisotropic cylinder-shape ferrite magnet for use in a motor to lower its noise and enable miniaturization thereof is formed of an integrated one-piece body formed of sintered Sr and/or Ba ferrite powders and has an axially-extending slit that is created before the body is sintered to reduce internal stress due to shrinkage. The slit can extend in parallel to both the axial and radial directions of the body, diagonally to both the axial and radial directions, or diagonally to the radial direction and parallel to the axial direction. The slit can be filled with a resin material.
    Type: Grant
    Filed: January 18, 1994
    Date of Patent: April 9, 1996
    Assignee: Sumitomo Special Metals Company, Limited
    Inventors: Takehisa Sakaguchi, Takahiro Sunaga, Jun Hoshijima