| 8739902 |
High-speed triple string drilling system |
— |
2014-06-03 |
| 8668029 |
Sonic latch mechanism |
Thomas J. Oothoudt |
2014-03-11 |
| 8474547 |
Isolation system for drilling systems |
Thomas J. Oothoudt |
2013-07-02 |
| 8356677 |
Methods of preloading a sonic drill head and methods of drilling using the same |
Kristian S. Drivdahl, Todd A. Nevenner, Kenneth Carl Altrichter |
2013-01-22 |
| 8261857 |
Core barrel sonic latch mechanism and methods of sonic drilling using the same |
Thomas J. Oothoudt |
2012-09-11 |
| 8079647 |
Vibratory milling machine having linear reciprocating motion |
Jing James Yao, Thomas J. Oothoudt |
2011-12-20 |
| 8056985 |
Vibratory machine |
Jing James Yao, Louis E. Silay |
2011-11-15 |
| 8006782 |
Sonic drill head |
Kristian S. Drivdahl, Todd A. Nevenner, Kenneth Carl Altrichter |
2011-08-30 |
| 7896108 |
Dual string orbital drilling system |
Charles C. Able |
2011-03-01 |
| 7828393 |
Continuous vibratory milling machine |
Jing James Yao, Louis E. Silay |
2010-11-09 |
| 7434890 |
Vibratory milling machine having linear reciprocating motion |
Jing James Yao, Louis E. Silay |
2008-10-14 |
| 6371205 |
Bore hole grouting apparatus and method |
Patrick Joseph Langan |
2002-04-16 |
| 6109373 |
Cable overshot apparatus |
— |
2000-08-29 |
| 6089335 |
Positive latch core barrel apparatus |
— |
2000-07-18 |