Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6257349 | Top head drive and mast assembly for drill rigs | — | 2001-07-10 |
| 5537778 | Security barrier apparatus | Herbert W. Morgan | 1996-07-23 |
| 5452542 | Security barrier apparatus | — | 1995-09-26 |
| 5022474 | Multiple blow percussion drill assembly with rapid field maintenance and adjustment capability | — | 1991-06-11 |
| 4466498 | Detachable shoe plates for large diameter drill bits | — | 1984-08-21 |
| 4440245 | Gravity percussion drill with upper end cocking spring and method of assembly | — | 1984-04-03 |