Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6810974 | Quick release drill bit for down-hole drills | Richard K. Smith | 2004-11-02 |
| 6799641 | Percussive drill with adjustable flow control | Warren T. Lay, Jeffrey White | 2004-10-05 |