Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Superconductive type
Reexamination Certificate
2006-05-23
2006-05-23
Donovan, Lincoln (Department: 2832)
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Superconductive type
C335S296000, C324S321000
Reexamination Certificate
active
07049913
ABSTRACT:
The present invention provides a superconductivity magnet apparatus for generating a uniform magnetic field suitable for NMR applications. The superconductivity magnet apparatus has an access port for allowing an access to the center of the magnetic field from an external position separated away from the center in a direction other than the axial direction of a split-type superconductivity electromagnet employed in the magnet apparatus. In the superconductivity magnet apparatus, a gap exists between first and second superconductivity coil blocks facing each other to form the split-type superconductivity electromagnet. To put it in detail, the access port allows an access to a measurement space at the center of the magnet by way of the gap. A configuration element of the magnet such as a coil bobbin is cut out for providing the access port. An area including a deficiency portion caused by the cutout portion or the like is filled up with a material having a relative magnetic permeability in the range 1.000 to 1.002 as an axis-symmetrical area. By using the material with a relative magnetic permeability in the range 1.000 to 1.002, the strength of an erroneously generated magnetic field can be reduced so that a magnet producing a uniform magnetic field can be provided.
REFERENCES:
patent: 6859036 (2005-02-01), Aihara et al.
patent: 2005/0083059 (2005-04-01), Morita et al.
patent: 7-240310 (1995-09-01), None
“NMR Descriptions”, Y. Arata, Published by Maruzen (2000), pp. 326-327.
Kajiura Souji
Kido Shuichi
Maki Kohji
Okada Michiya
Tsuchiya Mitsuyoshi
Antonelli, Terry Stout and Kraus, LLP.
Donovan Lincoln
Hitachi , Ltd.
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