Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
March 13, 2007
Patent Application Number
10614461
Date Filed
July 7, 2003
Patent Primary Examiner
Patent 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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