| 8061784 |
Retention system |
David R. Hall, Scott Dahlgren, Jonathan Marshall, Italo Elqueta, Christopher Durrand |
2011-11-22 |
| 8033615 |
Retention system |
David R. Hall, Scott Dahlgren, Jonathan Marshall, Italo Elqueta, Christopher Durrand |
2011-10-11 |
| 8020333 |
Cylinder with polycrystalline diamond interior |
David R. Hall, Ronald B. Crockett, Scott Dahlgren, Timothy C. Duke, Joshua Sensinger +1 more |
2011-09-20 |
| 8007051 |
Shank assembly |
David R. Hall, Ronald B. Crockett, Jeff Jepson, Jad A. Mills, Scott Dahlgren +1 more |
2011-08-30 |
| 7954401 |
Method of assembling a drill bit with a jack element |
David R. Hall, Francis Leany, Joe Fox |
2011-06-07 |
| 7946656 |
Retention system |
David R. Hall, Scott Dahlgren, Jonathan Marshall, Italo Elqueta, Christopher Durrand |
2011-05-24 |
| 7908851 |
Hydraulic energy storage with reinforced layer |
David R. Hall, Francis Leany, Jacob Hannon, Boyd Black |
2011-03-22 |
| 7866585 |
Rotary shaft impactor |
David R. Hall, Ronald B. Crockett, Jeff Jepson |
2011-01-11 |
| 7862126 |
Method of providing a degradation drum |
David R. Hall, Jad A. Mills |
2011-01-04 |
