Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6119798 | Rock drill bit and cutting inserts | Udo Fischer, Torbjorn Hartzell | 2000-09-19 |
| 5881828 | Rock drill bit and cutting inserts | Udo Fischer, Torbjorn Hartzell | 1999-03-16 |
| D371374 | Asymmetrical button insert for rock drilling | Udo Fischer, Torbjorn Hartzell | 1996-07-02 |
| D371146 | Asymmetrical button insert for rock drilling | Udo Fischer, Torbjorn Hartzell | 1996-06-25 |