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Cutting elements with wear resistant surfaces |
Mingdong Cai |
2020-09-01 |
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Apparatus and methods to manufacture PDC bits |
— |
2016-07-05 |
| 8955734 |
Ball hole welding using the friction stir welding (FSW) process |
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| 8763881 |
Methods of hardbanding joints of pipe using friction stir welding |
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Hardfaced drill bit structures and method for making such structures |
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Hard facing for milled tooth rock bits |
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Hard facing for milled tooth rock bits |
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1989-06-06 |
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Hermetically welded belleville seal for rock bits |
Nareshchandra J. Kar |
1986-12-30 |
| 4560175 |
Hermetically welded belleville seal for rocks bits |
Nareshchandra J. Kar |
1985-12-24 |