| 9328608 |
Driven latch mechanism |
Christopher L. Drenth, George Iondov |
2016-05-03 |
| 9234398 |
Core drilling tools with retractably lockable driven latch mechanisms |
Christopher L. Drenth, George Iondov |
2016-01-12 |
| 8794355 |
Driven latch mechanism |
Christopher L. Drenth, George Iondov |
2014-08-05 |
| 8770319 |
Pump-in seal |
Christopher L. Drenth, George Iondov |
2014-07-08 |
| 8485280 |
Core drilling tools with retractably lockable driven latch mechanisms |
Christopher L. Drenth, George Iondov |
2013-07-16 |
| D676877 |
Tube loader |
Christopher L. Drenth, Jay S. Averett, Tony Wiki, Cliff Wiki |
2013-02-26 |
| 8127864 |
Hydro-percussive mechanisms for drilling systems |
Christopher L. Drenth |
2012-03-06 |
| 7921926 |
Jointed spearhead assembly |
Christopher L. Drenth, Anthony Lachance |
2011-04-12 |
| 7900716 |
Vibratory unit for drilling systems |
Christopher L. Drenth, Anthony Lachance |
2011-03-08 |
| D624564 |
Spearhead base |
Christopher L. Drenth, Sacha Tillack |
2010-09-28 |
| D622741 |
Spearhead |
Christopher L. Drenth, Sacha Tillack |
2010-08-31 |
| D622293 |
Spearhead |
Christopher L. Drenth, Sacha Tillack |
2010-08-24 |
| D622294 |
Spearhead base |
Christopher L. Drenth, Sacha Tillack |
2010-08-24 |