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Rod and casing handler |
— |
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| 10370900 |
Remote control of stroke and frequency of percussion apparatus and methods thereof |
— |
2019-08-06 |
| 10150652 |
Rod and casing handler |
— |
2018-12-11 |
| 8173946 |
Method of intercepting incoming projectile |
James H. Dupont, Richard D. Loehr, Henri Y. Kim, Garrett L. Hall, James M. Cook |
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| 8028772 |
Internally dampened percussion rock drill |
Glenn Patterson |
2011-10-04 |
| 7895948 |
Buoyancy dissipater and method to deter an errant vessel |
James H. Dupont, Richard D. Loehr |
2011-03-01 |
| 7730838 |
Buoyancy dissipater and method to deter an errant vessel |
James H. Dupont, Richard D. Loehr |
2010-06-08 |
| 7681664 |
Internally dampened percussion rock drill |
Glenn Patterson |
2010-03-23 |
| 7665514 |
Drill stem guide and wrench apparatus |
— |
2010-02-23 |
| 6464023 |
Hydraulic in-the-hole percussion rock drill |
— |
2002-10-15 |
| 6293357 |
Hydraulic in-the-hole percussion rock drill |
— |
2001-09-25 |
| 6155361 |
Hydraulic in-the-hole percussion rock drill |
— |
2000-12-05 |
| 5680904 |
In-the-hole percussion rock drill |
— |
1997-10-28 |
| 5064002 |
Concentric drill rod assemblies for percussion rock drills |
— |
1991-11-12 |
| 5050688 |
Rock drill feed support |
— |
1991-09-24 |
| 4828048 |
Hydraulic Percussion tool |
James R. Mayer |
1989-05-09 |
