Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft
Reexamination Certificate
2011-07-12
2011-07-12
Bagnell, David J (Department: 3676)
Boring or penetrating the earth
With storage means for bit lubricant carried by bit or shaft
C175S228000
Reexamination Certificate
active
07975782
ABSTRACT:
An earth bit includes a cutting cone mounted to a lug to form a bearing cavity. A valve is in fluid communication with the bearing cavity and a bit chamber, wherein the valve includes a diaphragm with an aperture. The aperture is repeatably moveable between open and closed conditions in response to a pressure difference between the material in the bearing cavity and bit chamber.
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Dictionary definitions of “include,” “dispose,” “comprise,” “contain,” and “arrange”, accessed Jan. 20, 2011 via www.thefreedictionary.com.
Atlas Copco Secoroc LLC
Bagnell David J
Michener Blake
Schmeiser Olsen & Watts LLP
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