| 10633943 |
Braking devices for drilling operations, and systems and methods of using same |
Christopher L. Drenth, Martin Romeo Savoie |
2020-04-28 |
| 10053973 |
Braking devices for drilling operations, and systems and methods of using same |
Christopher L. Drenth, Martin Romeo Savoie |
2018-08-21 |
| 9540897 |
Overshot assembly and systems and methods of using same |
Christopher L. Drenth, Anthony Lachance |
2017-01-10 |
| 9528337 |
Up-hole bushing and core barrel head assembly comprising same |
— |
2016-12-27 |
| 9399898 |
Core drilling tools with retractably lockable driven latch mechanisms |
Charles Ernest Muntz, Christopher L. Drenth |
2016-07-26 |
| 9328608 |
Driven latch mechanism |
Christopher L. Drenth, George Ibrahim |
2016-05-03 |
| 9234398 |
Core drilling tools with retractably lockable driven latch mechanisms |
Christopher L. Drenth, George Ibrahim |
2016-01-12 |
| 8794355 |
Driven latch mechanism |
Christopher L. Drenth, George Ibrahim |
2014-08-05 |
| 8770319 |
Pump-in seal |
Christopher L. Drenth, George Ibrahim |
2014-07-08 |
| 8770322 |
Latch body components having multiple functions, and drilling head assembly incorporating same |
Christopher L. Drenth, Anthony Lachance |
2014-07-08 |
| 8485280 |
Core drilling tools with retractably lockable driven latch mechanisms |
Christopher L. Drenth, George Ibrahim |
2013-07-16 |