|
| US4852672 | 15. Aug. 1988 | 1. Aug. 1989 | | Drill apparatus having a primary drill and a pilot drill |
| US5788430 | 18. März 1996 | 4. Aug. 1998 | Hawera Probst GmbH | Drilling tool for rotary percussion drilling |
| US6116827 | 14. Sept. 1998 | 12. Sept. 2000 | Hawera Probst GmbH | Drilling tool |
| US6213230 | 5. Nov. 1998 | 10. Apr. 2001 | Hawera Probst GmbH | Drilling tool especially for the rotary percussion drilling of preferably rock |
| US7270196 | 21. Nov. 2005 | 18. Sept. 2007 | | Drill bit assembly |
| US7419016 | 1. März 2007 | 2. Sept. 2008 | | Bi-center drill bit |
| US7624824 | 26. Febr. 2008 | 1. Dez. 2009 | | Downhole hammer assembly |
| US7866416 | 4. Juni 2007 | 11. Jan. 2011 | Schlumberger Technology Corporation | Clutch for a jack element |
| US7954401 | 27. Okt. 2006 | 7. Juni 2011 | Schlumberger Technology Corporation | Method of assembling a drill bit with a jack element |
| US7967083 | 9. Nov. 2009 | 28. Juni 2011 | Schlumberger Technology Corporation | Sensor for determining a position of a jack element |
| US8011457 | 26. Febr. 2008 | 6. Sept. 2011 | Schlumberger Technology Corporation | Downhole hammer assembly |
| US8020471 | 27. Febr. 2009 | 20. Sept. 2011 | Schlumberger Technology Corporation | Method for manufacturing a drill bit |
| US8191651 | 31. März 2011 | 5. Juni 2012 | | Sensor on a formation engaging member of a drill bit |
| US8225883 | 31. März 2009 | 24. Juli 2012 | Schlumberger Technology Corporation | Downhole percussive tool with alternating pressure differentials |
