Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11111729 | Multi-indenter hammer drill bits and method of fabricating | — | 2021-09-07 |
| 10876359 | Multi-accumulator arrangement for hydraulic percussion mechanism | Joseph Purcell | 2020-12-29 |
| 10808476 | Drill rod for percussion drill tool | Joseph Purcell, Hongbin Wang | 2020-10-20 |
| 9126203 | Rock crushing apparatus | — | 2015-09-08 |
| 8893827 | Drilling apparatus | — | 2014-11-25 |
| 8887835 | Drilling apparatus | — | 2014-11-18 |