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Patent applications and USPTO patent grants for Cawthorne; Chris.The latest application filed is for "rock bit seal with extrusion prevention member".
Patent | Date |
---|---|
Rock bit seal with extrusion prevention member Grant 6,820,704 - Mourik , et al. November 23, 2 | 2004-11-23 |
Roller cone bits with wear and fracture resistant surface Grant 6,615,935 - Fang , et al. September 9, 2 | 2003-09-09 |
Rock bit seal with multiple dynamic seal surface elements Grant 6,536,542 - Fang , et al. March 25, 2 | 2003-03-25 |
Rock bit seal with extrusion prevention member App 20030029645 - Mourik, Nephi ;   et al. | 2003-02-13 |
Roller cone bits with wear and fracture resistant surface App 20020162691 - Fang, Zhigang ;   et al. | 2002-11-07 |
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