Patents by Inventor Sumikazu Oki

Sumikazu Oki 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).

  • Magnetic marker and manufacturing method therefor
    Patent number: 6864793
    Abstract: A magnetic marker comprises a magnetically switchable wire and a magnetic casing that covers the magnetically switchable wire. The magnetically switchable wire is formed of a magnetic material that undergoes occurrence of sharp magnetic inversion when an alternating field of intensity higher than its coercive force is applied to it. The magnetic casing is formed of a magnetically hard or semihard magnetic material and can apply a bias magnetic field to the magnetically switchable wire to prevent magnetic inversion of the magnetically switchable wire. Heat-treated portions and high-coercivity regions, which are not heat-treated, are formed alternately in the longitudinal direction on the magnetic casing. The heat-treated portions are given magnetic properties different from magnetic properties essential to the magnetic casing by heat treatment such as annealing.
    Type: Grant
    Filed: March 14, 2002
    Date of Patent: March 8, 2005
    Assignee: NHK Spring Co., Ltd.
    Inventors: Yoshiki Ono, Tatsuya Kurihara, Shigemi Sato, Sumikazu Oki
  • Magnetic marker and manufacturing method therefor
    Publication number: 20020122956
    Abstract: A magnetic marker comprises a magnetically switchable wire and a magnetic casing that covers the magnetically switchable wire. The magnetically switchable wire is formed of a magnetic material that undergoes occurrence of sharp magnetic inversion when an alternating field of intensity higher than its coercive force is applied to it. The magnetic casing is formed of a magnetically hard or semihard magnetic material and can apply a bias magnetic field to the magnetically switchable wire to prevent magnetic inversion of the magnetically switchable wire. Heat-treated portions and high-coercivity regions, which are not heat-treated, are formed alternately in the longitudinal direction on the magnetic casing. The heat-treated portions are given magnetic properties different from magnetic properties essential to the magnetic casing by heat treatment such as annealing.
    Type: Application
    Filed: March 14, 2002
    Publication date: September 5, 2002
    Applicant: NHK SPRING CO., LTD.
    Inventors: Yoshiki Ono, Tatsuya Kurihara, Shigemi Sato, Sumikazu Oki