Boring or penetrating the earth – Boring by below ground recirculation of unsupported elements
Reexamination Certificate
2004-07-08
2008-10-07
Bagnell, David J (Department: 3676)
Boring or penetrating the earth
Boring by below ground recirculation of unsupported elements
C175S067000, C175S424000
Reexamination Certificate
active
07431104
ABSTRACT:
A device for transporting magnetic particles in a selected direction has a support surface extending in the selected direction, a magnet arranged to generate a magnetic field for retaining the particles on the support surface such that the magnetic field on the support surface has high- and low-field bands and a magnetic field gradient zone between the high- and low-bands, means for advancing the high- and low-bands relative to the support surface in a direction having a component in the direction of the gradient, wherein along the high-field band at least first and second magnetic poles of opposite polarity are arranged such that a first magnetic path on the support surface from the first pole to the second pole is shorter than a second magnetic path on the support surface crossing the gradient zone from the first pole to any other nearest pole of opposite polarity.
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International Search Report dated Sep. 13, 2004 (PCT/EP2004/051407).
Bagnell David J
Fuller Robert E
Shell Oil Company
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