Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6513607 | Metal-face-seal rock bit | Gregory W. Peterson | 2003-02-04 |
| 6367569 | Replaceable multiple TCI kerf ring | — | 2002-04-09 |
| 5092412 | Earth boring bit with recessed roller bearing | — | 1992-03-03 |
| 4832135 | Flow through raise boring bit | Gregory L. Hern | 1989-05-23 |
| 4697652 | Reversible roller stabilizer extensions for earth boring head | — | 1987-10-06 |