Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
October 17, 2006
Patent Application Number
10744112
Date Filed
December 23, 2003
Patent Primary Examiner
Patent 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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