Seal for a joint or juncture – Process of dynamic sealing – Close proximity seal
Reexamination Certificate
2007-03-13
2007-03-13
Pickard, Alison K. (Department: 3673)
Seal for a joint or juncture
Process of dynamic sealing
Close proximity seal
C277S410000
Reexamination Certificate
active
10614461
ABSTRACT:
A magnetic assembly for a multistage magnetic fluid rotary seal has a shaft, an annular permanent magnet, at least one pole piece and a radial gap formed between the shaft and the pole piece. The shaft and the pole piece have a plurality of trapezoidal-shaped ridges in opposing, non-contacting relationship forming the radial gap. The trapezoidal-shaped ridges have a flat top portion facing the radial gap and tapered sides that diverge away from the top portion.
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DeLeault Robert R.
Mesmer & DeLeault, PLLC
Pickard Alison K.
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