Issued Patents All Time
Showing 26–50 of 68 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8789891 | Method and apparatus for creating a planar cavern | Steven W. Wentworth, Samuel T. Ariaratnam | 2014-07-29 |
| 8646846 | Method and apparatus for creating a planar cavern | Steven W. Wentworth, Samuel T. Ariaratnam | 2014-02-11 |
| 8225885 | Joint for use in back reaming | Steven W. Wentworth | 2012-07-24 |
| 8157478 | Rod pushing and pulling machine | Steven W. Wentworth | 2012-04-17 |
| 7993078 | Method and apparatus for installing an underground pipe | — | 2011-08-09 |
| 7909539 | Rod pulling and pushing machine for pipe bursting | Steven W. Wentworth | 2011-03-22 |
| 7559722 | Method and apparatus for pipe reforming and clearing | — | 2009-07-14 |
| 7255516 | Method and apparatus for replacement of underground pipe | Steven W. Wentworth, Mark D. Randa | 2007-08-14 |
| 7140806 | Rod pulling and pushing machine for pipe bursting | Steven W. Wentworth | 2006-11-28 |
| 7086808 | Method and apparatus for on-grade boring | Steven W. Wentworth, Mark D. Randa | 2006-08-08 |
| 6913091 | Method and apparatus for replacement of underground pipe | Steven W. Wentworth, Mark D. Randa | 2005-07-05 |
| 6860514 | Drill string joint | Steven W. Wentworth, Mark D. Randa | 2005-03-01 |
| 6789635 | Drill bit for directional drilling in cobble formations | Steven W. Wentworth, Douglas Caraway | 2004-09-14 |
| 6755593 | Pipe replacement method and rotary impact mechanism for pipe bursting | Steven W. Wentworth, Paul Hau | 2004-06-29 |
| 6655874 | Method and apparatus for slitting flexible pipe in an underground bore | Steven W. Wentworth | 2003-12-02 |
| 6588515 | Drill bit for directional drilling | Steven W. Wentworth | 2003-07-08 |
| 6568488 | Roller pipe burster | Steven W. Wentworth, Paul Hau | 2003-05-27 |
| 6533052 | Drill bit for impact-assisted directional boring | Steven W. Wentworth, Mark D. Randa, Randy R. Runquist, Richard K. Smith | 2003-03-18 |
| 6516899 | Method and apparatus for directional boring under mixed conditions | Steven W. Wentworth, Randy R. Runquist, Mark Van Houwelingen | 2003-02-11 |
| 6470979 | Sonde housing structure | Steven W. Wentworth | 2002-10-29 |
| 6450269 | Method and bit for directional horizontal boring | Steven W. Wentworth | 2002-09-17 |
| 6439319 | Method and apparatus for directional boring under mixed conditions | Steven W. Wentworth, Randy R. Runquist, Mark Van Houwelingen | 2002-08-27 |
| 6390207 | Method and apparatus for directional boring under mixed conditions | Steven W. Wentworth, Randy R. Runquist, Mark Van Houwelingen | 2002-05-21 |
| 6390087 | Drill bit for directional drilling | Steven W. Wentworth | 2002-05-21 |
| 6371223 | Drill head for directional boring | Steven W. Wentworth | 2002-04-16 |