Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting
Reexamination Certificate
2007-05-08
2007-05-08
Bagnell, David (Department: 3672)
Boring or penetrating the earth
With above-ground means for handling drilling fluid or cutting
C175S214000, C166S078100, C277S420000
Reexamination Certificate
active
11427196
ABSTRACT:
A controlled leakage seal assembly having a first stationary portion adapted to be connected in substantially fluid-tight relation to a source of drilling fluid and a second portion adapted to be connected in substantially fluid-tight relation to a rotary portion including a washpipe. The seal includes a first housing and a stack of radially inwardly extending, spaced apart annular stators, and a second seal housing and stack of spaced apart radially outwardly extending annular rotors interleaved with one another. The seal assembly, a cartridge, permits the first and second housings to rotate relative to each other in substantially fluid-tight relation except for the drilling fluid entering an outlet region at greatly reduced pressure. In a preferred embodiment, the seal is held by a sleeve that permits the cartridge to be removed and replaced while the fluid connections to the sleeve remains.
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Bagnell David
Coy Nicole A
SKF USA Inc.
Vedder Price Kaufman & Kammholz
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