Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5709276 | Multi-position directional drill | — | 1998-01-20 |
| 5253721 | Directional boring head | — | 1993-10-19 |
| 5231899 | Drilling rig breakout wrench system | — | 1993-08-03 |
| 5148880 | Apparatus for drilling a horizontal controlled borehole in the earth | Arthur D. Deken, James E. Franklin, Richard P. Dunn | 1992-09-22 |
| 4958689 | Method of providing a high pressure surge of working fluid to an underground percussive mole | — | 1990-09-25 |
| 4928775 | Downhole surge valve for earth boring apparatus | — | 1990-05-29 |
| 4907658 | Percussive mole boring device with electronic transmitter | Gerald A. Stangl, Dirk A. Wilson | 1990-03-13 |
| 4834193 | Earth boring apparatus and method with control valve | Curtis E. Leitko, Jr., Michael R. Wasson, Gerald A. Stangl | 1989-05-30 |