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1955-06-02 |
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1955-08-16 |
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1965-04-12 |
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Shell Oil Co |
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1966-10-12 |
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Kelsey-Hayes Company |
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1977-06-22 |
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1977-12-09 |
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Drill bit
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1978-11-30 |
1980-11-18 |
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1978-12-18 |
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1992-02-25 |
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Earth boring drill bit with matrix displacing material
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Precision roller bearing rock bits
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Cutting elements for roller cutter drill bits
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Camco International Inc. |
Means for mounting a roller cutter on a drill bit
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Aluminum and boron nitride thermal spray powder
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Drill bit having polycrystalline diamond compact cutter with spherical first end opposite cutting end
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Earth-burning bit having an improved hard-faced tooth structure
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Baker Hughes Incorporated |
Steel tooth bit with a bi-metallic gage hardfacing
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Roller cone bits with wear and fracture resistant surface
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