|
| US3994350 | 14 oct. 1975 | 30 nov. 1976 | Gardner-Denver Company | Rotary drilling rig |
| US4147215 | 9 mars 1978 | 3 avr. 1979 | Hughes Tool Company | Independently powered breakout apparatus and method for a sectional drill string |
| US4266444 | 14 juin 1979 | 12 mai 1981 | Longyear Company | High-low speed rotary drive mechanism |
| US4605077 | 4 déc. 1984 | 12 août 1986 | Varco International, Inc. | Top drive drilling systems |
| US4865135 | 20 mai 1988 | 12 sept. 1989 | Hughes Tool Company | Top drive torque reactor |
| US4974686 | 30 juin 1989 | 4 déc. 1990 | Oy Tampella AB | Apparatus for handling a drilling equipment |
| US5388651 | 20 avr. 1993 | 14 févr. 1995 | Bowen Tools, Inc. | Top drive unit torque break-out system |
| US5575344 | 12 mai 1995 | 19 nov. 1996 | Reedrill Corp. | Rod changing system |
| US5622232 | 5 juil. 1994 | 22 avr. 1997 | Harnischfeger Corporation | Blasthole drill with drill-through pipe rack |
| US5653297 | 14 avr. 1995 | 5 août 1997 | Harnischfeger Corporation | Blasthole drill with improved automatic breakout wrench |
| US7424920 | 24 sept. 2004 | 16 sept. 2008 | Atlas Copco Rock Drills AB | Method and device for impact loosening of thread joints |
| US7513300 | 20 mars 2007 | 7 avr. 2009 | Weatherford/Lamb, Inc. | Casing running and drilling system |
