Patents by Inventor Hideko Arai

Hideko Arai 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).

  • Method for producing a magnet roll
    Patent number: 5384957
    Abstract: A method of producing a magnet roll in which a magnetic property comparable to that obtained by an injection molding can be obtained in spite of an extrusion molding. According to a first embodiment, the yoke width of the magnetic-field extrusion die is varied along an extrusion direction. According to a second embodiment, a pipe filled with resin bonded magnet material is used as a shaft. According to a third embodiment, a shaft having a groove which is filled with magnet is used. According to a fourth embodiment, a shaft provided with surface magnetic charge is used. According to a fifth embodiment, a magnetized region of a shaft is set to be shorter than the length of a main magnet. According to a sixth embodiment, an extruded matter is moved while stored in a sizing metal mold having a magnetic circuit structure.
    Type: Grant
    Filed: December 21, 1992
    Date of Patent: January 31, 1995
    Assignee: Kanegafuchi Kagaka Kogyo Kabushiki Kaisha
    Inventors: Fumihito Mohri, Hideko Arai, Yoshio Sakata