Seal for a joint or juncture – Seal between relatively movable parts – Close proximity seal
Reexamination Certificate
2008-07-15
2008-07-15
Pickard, Alison K (Department: 3676)
Seal for a joint or juncture
Seal between relatively movable parts
Close proximity seal
Reexamination Certificate
active
07398974
ABSTRACT:
A magneto-fluidic seal includes a shaft; a sleeve surrounding the shaft; a housing made of soft magnetic material surrounding the sleeve; a magnet conducting a magnetic flux to the sleeve; and a magnetic fluid in a gap between the sleeve and the shaft, and/or in a gap between the sleeve and the housing. Optionally, the sleeve includes a channel on a longitudinal side, and wherein the magnet is positioned in the channel. The channel can be substantially circular or polyhedral. The magnet is preferably offset from a bottom of the channel, and oriented radially. Preferably, the magnet includes a plurality of segments, or flat plate-shaped magnets, arranged substantially evenly and circumferentially around the shaft.
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Methods of regulating charging and functional properties of oil-solvable surface-active agents and lubricants, Chapter 8 (1978).
Lysenkov Sergei G.
Mikhalev Yuri O.
Bardmesser Law Group
Ferrolabs, Inc.
Pickard Alison K
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