| 6401843 |
Drilling head with a cone rock bit |
Patrick Fayaud, Bernard Tissier, Pierre Lecour |
2002-06-11 |
| 6102142 |
Drilling tool with shock absorbers |
Robert Delwiche, Pierre Lecour |
2000-08-15 |
| 6068072 |
Cutting element |
Gary M. Thigpen, Coy M. Fielder |
2000-05-30 |
| 5957227 |
Blade-equipped drilling tool, incorporating secondary cutting edges and passages designed for the removal of evacuated material |
Kenneth Blackwood |
1999-09-28 |
| 5823277 |
Cutting edge for monobloc drilling tools |
Robert Delwiche |
1998-10-20 |
| 5592995 |
Earth-boring bit having shear-cutting heel elements |
Danny E. Scott, Rudolf Carl Pessier, Matthew R. Isbell, Nigel Charles Meany |
1997-01-14 |
| 5562171 |
Anti-balling drill bit |
Rudolf Carl Pessier |
1996-10-08 |
| 5397954 |
Elastic support device for stator winding end turns |
— |
1995-03-14 |
| 5301762 |
Drilling tool fitted with self-sharpening cutting edges |
— |
1994-04-12 |
| 5293946 |
Divergent fluid nozzle for drilling tool |
Bernard Ponineau |
1994-03-15 |
| 5282512 |
Drilling tool with rotating conical rollers |
Patrick Toutain |
1994-02-01 |
| 5230389 |
Fluidic oscillator drill bit |
— |
1993-07-27 |