Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Reexamination Certificate
2006-05-23
2006-05-23
Gutierrez, Diego (Department: 2859)
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
C335S299000, C335S296000, C335S216000, C324S318000, C324S319000
Reexamination Certificate
active
07049920
ABSTRACT:
In a superconductive magnet device comprising upper and lower vacuum vessels coupled by a coupling conduit, the upper and lower vacuum vessels9and the coupling conduit24coupling them are made of a high electric-resistance material so that the magnetic flux of gradient magnetic field coils reaches the upper and lower pair of a second heat shields8and a coupling conduit23coupling the pair of the second heat shields8.The coupling conduit23coupling the upper and lower pair of the second heat shields8is provided with a slit (cut)41extending in the vertical direction so that no eddy currents occur and thus eddy currents generated asymmetrically in the coupling conduit23are reduced. Artifacts caused by asymmetrical eddy currents can by reduced in an MRI apparatus using such a magnet device.
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Goldie Fred
Yoshino Hitoshi
Antonelli Terry, Stout and Kraus, LLP
Fetzner Tiffany A.
Gutierrez Diego
Hitachi Medical Corporation
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