Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7117939 | Percussion hammer bit retainer apparatus | Gregory Dee Hawley | 2006-10-10 |
| 6918455 | Drill bit with large inserts | Carl W. Keith, Huy D. Bui | 2005-07-19 |
| 5065827 | Hammer bit retention tool | David E. Drake, Charles W. Witt | 1991-11-19 |