Issued Patents All Time
Showing 51–68 of 68 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6321858 | Bit for directional drilling | Steven W. Wentworth | 2001-11-27 |
| 6302410 | Rod gripping jaw | Steven W. Wentworth | 2001-10-16 |
| 6283229 | Impact device for directional boring | Steven W. Wentworth | 2001-09-04 |
| 6273201 | Pneumatic ground piercing tool with movable chisel head | Mark D. Randa, Steven W. Wentworth | 2001-08-14 |
| 6263983 | Apparatus for directional drilling | Steven W. Wentworth | 2001-07-24 |
| 6260634 | Sonde housing for directional drilling | Steven W. Wentworth | 2001-07-17 |
| 6261027 | Portable pulling apparatus | Steven W. Wentworth | 2001-07-17 |
| 6171026 | Method and apparatus for replacement of pipelines | Steven W. Wentworth | 2001-01-09 |
| 6148935 | Joint for use in a directional boring apparatus | Steven W. Wentworth | 2000-11-21 |
| 5687803 | Method for reversing a ground piercing tool | Steven W. Wentworth, Mark D. Randa | 1997-11-18 |
| 5651639 | Method and apparatus for installation of underground pipe | Steven W. Wentworth | 1997-07-29 |
| 5603383 | Reversible pneumatic ground piercing tool | Steven W. Wentworth, Mark D. Randa | 1997-02-18 |
| 5487430 | Pneumatic ground-piercing tool and body therefor | Steven W. Wentworth, Jon A. Haas | 1996-01-30 |
| 5465797 | Pneumatic ground piercing tool with detachable head | Steven W. Wentworth, Jon A. Haas, Payce D. Reynolds | 1995-11-14 |
| 5440797 | Method for making a pneumatic ground piercing tool | Steven W. Wentworth, Jon A. Hass | 1995-08-15 |
| 5337837 | Dual-diameter pneumatic ground piercing tool | Steven W. Wentworth, Jon A. Haas, Payce D. Reynolds | 1994-08-16 |
| 5199151 | Method for making a pneumatic ground piercing tool | Steven W. Wentworth, Jon A. Haas | 1993-04-06 |
| 5025868 | Pneumatic ground piercing tool | Steven W. Wentworth, Jon A. Haas | 1991-06-25 |