Patents by Inventor Yoji Ishikura

Yoji Ishikura 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 shielding material, magnetic shielding component, and magnetic shielding room
    Patent number: 8157929
    Abstract: Disclosed are: a magnetic shielding material having excellent magnetic shielding property at a low magnetic field; and a magnetic shielding component and a magnetic shielding room each using the magnetic shielding material. Specifically disclosed is a magnetic shielding material comprising the following components (by mass): Ni: 70.0-85.0%, Cu: 0.6% or less, Mo: 10.0% or less and Mn: 2.0% or less, with the remainder being substantially Fe. The magnetic shielding material has a relative magnetic permeability of 40,000 or more under a magnetic field of 0.05 A/m and a squareness ratio (Br/B0.8) of 0.85 or less, wherein the squareness ratio (Br/B0.8) is a ratio of a remanent magnetic flux density (Br) to a maximum magnetic flux density (B0.8) in a DC hysteresis curve produced under the maximum magnetic field of 0.8 A/m.
    Type: Grant
    Filed: February 12, 2008
    Date of Patent: April 17, 2012
    Assignee: Hitachi Metals, Ltd.
    Inventors: Shin-ichiro Yokoyama, Yasuyuki Ilda, Hakaru Sasaki, Yoji Ishikura, Hiromitsu Itabashi, Masahiro Mita, Yoshiyuki Fujihara
  • MAGNETIC SHIELDING MATERIAL, MAGNETIC SHIELDING COMPONENT, AND MAGNETIC SHIELDING ROOM
    Publication number: 20100047111
    Abstract: Disclosed are: a magnetic shielding material having excellent magnetic shielding property at a low magnetic field; and a magnetic shielding component and a magnetic shielding room each using the magnetic shielding material. Specifically disclosed is a magnetic shielding material comprising the following components (by mass): Ni: 70.0-85.0%, Cu: 0.6% or less, Mo: 10.0% or less and Mn: 2.0% or less, with the remainder being substantially Fe. The magnetic shielding material has a relative magnetic permeability of 40,000 or more under a magnetic field of 0.05 A/m and a squareness ratio (Br/B0.8) of 0.85 or less, wherein the squareness ratio (Br/B0.8) is a ratio of a remanent magnetic flux density (Br) to a maximum magnetic flux density (B0.8) in a DC hysteresis curve produced under the maximum magnetic field of 0.8 A/m.
    Type: Application
    Filed: February 12, 2008
    Publication date: February 25, 2010
    Applicant: Hitachi Metals Ltd
    Inventors: Shin-ichiro Yokoyama, Yasuyuki Iida, Hakaru Sasaki, Yoji Ishikura, Hiromitsu Itabashi, Masahiro Mita, Yoshiyuki Fujihara