Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft
Reexamination Certificate
2006-10-17
2006-10-17
Neuder, William (Department: 3672)
Boring or penetrating the earth
With storage means for bit lubricant carried by bit or shaft
C175S228000, C508S150000, C508S155000, C508S167000
Reexamination Certificate
active
07121365
ABSTRACT:
A lubricating grease is specific for a rock bit for drilling subterranean formations. The rock bit body includes a plurality of journal pins, each having a bearing surface, with a cutter cone mounted on each journal pin and also including a bearing surface. A grease reservoir provides lubricating grease to such bearing surfaces. The grease composition adjacent the bearing surfaces comprises a lubricating base oil, sufficient thickener and additives in the base oil to form a rock bit grease, and an effective amount of polarized graphite.
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Dr. Ruediger Holinski and Dr. Manfred Jungk, (NLGI Annual General Meeting, Oct. 23-27, 1999) New Solid Lubricants as Additive for Greases—“Polarized Graphite”—Dow Corning Corporation, pp. 1-7.
Dr. Ruediger Holinski and Dr. Manfred Jungk, New Solid Lubricants as Additive for Greases—“Polarized Graphite”—Dow Corning GmbH, (Version 2) NLGI Spokesman, Sep. 2000, vol. 64, No. 6, pp. 23-27.
Denton Robert M.
Lockstedt Alan W.
Christie Parker & Hale, LLP.
Smith International Inc.
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