Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5863272 | Raise drill assembly with two-piece planetary third reduction hub and out put shaft | — | 1999-01-26 |
| 5664606 | Drill pipe having concave wrenching recesses | — | 1997-09-09 |
| 5649745 | Inflatable gripper assembly for rock boring machine | — | 1997-07-22 |
| 5598895 | Cutter assembly having a plurality of independently rotatable cutting units thereon | Gregory L. Hern | 1997-02-04 |
| 5429198 | Down reaming apparatus having hydraulically controlled stabilizer | Thomas C. Whitehouse | 1995-07-04 |
| 5370194 | Drive head assembly for drilling machine | — | 1994-12-06 |
| 5325932 | Down reaming apparatus | Brian W. Kelley, Larry F. Rowe, Thomas C. Whitehouse | 1994-07-05 |
| 5012878 | Rock boring machine drive head with up and down drilling capability | — | 1991-05-07 |