Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Reexamination Certificate
2005-06-21
2005-06-21
Donovan, Lincoln (Department: 2832)
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
C335S299000
Reexamination Certificate
active
06909347
ABSTRACT:
A magnet for MRI apparatus has a magnetic circuit which includes a magnetic flux path formed by a ferromagnetic material and a magnetic flux path formed by magnetic flux return coils or magnetic flux control coils, so that a 5-gauss line of leakage fluxes can be kept within a sphere 3 m in radius even when the static magnetic field intensity exceeds 1 tesla and a comparatively light magnet for MRI apparatus can be provided. Further, the fluxes escaping vertically from the static magnetic field sources are led compactly to a horizontal direction by installing magnetic flux paths of ferromagnetic materials and coils with polarities opposing those of the static magnetic fields. This arrangement minimizes an increase in the total height of the magnet for MRI apparatus, keeping the magnet within the total height of 3 m.
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Kakugawa Shigeru
Okada Michiya
Wakuda Tsuyoshi
Watanabe Hiroyuki
Donovan Lincoln
Hitachi , Ltd.
McDermott Will & Emery LLP
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