| 8006784 |
Backhead and drill assembly with backhead |
— |
2011-08-30 |
| 7617889 |
Backhead and drill assembly with backhead |
— |
2009-11-17 |
| 7395883 |
Keyed connection for drill bit |
— |
2008-07-08 |
| 6609577 |
Percussive rotational impact hammer |
— |
2003-08-26 |
| 6502650 |
Percussive down-the-hole hammer for rock drilling, and a drill bit used therein |
— |
2003-01-07 |
| 6209666 |
Percussive down-the-hole hammer and a piston and drill bit therefor |
Bengt Asberg |
2001-04-03 |
| 6131672 |
Percussive down-the-hole rock drilling hammer and piston therefor |
Matt Shofner, Kenneth Ahlhorn |
2000-10-17 |
| 6125952 |
Percussive down-the-hole hammer and a drill bit therefor |
Bengt sberg |
2000-10-03 |
| 6062322 |
Precussive down-the-hole rock drilling hammer |
Matt Shoffner, Kenneth Ahlhorn |
2000-05-16 |
| 6021855 |
Method, drilling tool and rock drill bit for transferring impact energy from a top hammer unit |
Per-Olof Liljebrand, Urban Olsson, Jan-Erik Sundstrom |
2000-02-08 |
| 5984030 |
Rock drilling tool, drill bit and a method of transferring percussive energy |
Kenneth Larsson |
1999-11-16 |
| 5931243 |
Hammer device |
— |
1999-08-03 |
| 5305841 |
Hammer device |
— |
1994-04-26 |