Issued Patents All Time
Showing 1–17 of 17 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7487831 | Downhole surge pressure reduction and filtering apparatus | Clayton Stanley Pluchek, Richard L. Giroux, Thad Scott, David M. Haugen | 2009-02-10 |
| 7270181 | Downhole surge pressure reduction and filtering apparatus | Clayton Stanley Pluchek, Richard L. Giroux, Thad Scott, David M. Haugen | 2007-09-18 |
| 7225870 | Hydraulic tools for setting liner top packers and method for cementing liners | David Hirth | 2007-06-05 |
| 7172029 | Bi-directionally boosting and internal pressure trapping packing element system | David Hirth, Tarald Gudmestad | 2007-02-06 |
| 7055611 | Plug-dropping container for releasing a plug into a wellbore | David Hirth | 2006-06-06 |
| 6966375 | Downhole surge pressure reduction and filtering apparatus | Clayton Stanley Pluchek, Richard L. Giroux, Thad Scott, David M. Haugen | 2005-11-22 |
| 6908121 | Locking arrangement for a threaded connector | David Hirth, Tarald Gudmestad, Mark J. Murray | 2005-06-21 |
| 6902008 | Bi-directionally boosting and internal pressure trapping packing element system | David Hirth, Tarald Gudmestad | 2005-06-07 |
| 6866100 | Mechanically opened ball seat and expandable ball seat | Tarald Gudmestad, David Hirth | 2005-03-15 |
| 6776228 | Ball dropping assembly | David Hirth | 2004-08-17 |
| 6755252 | Downhole surge pressure reduction and filtering apparatus | Clayton Stanley Pluchek, Richard L. Giroux, Thad Scott, David M. Haugen | 2004-06-29 |
| 6715541 | Ball dropping assembly | David Hirth | 2004-04-06 |
| 6672384 | Plug-dropping container for releasing a plug into a wellbore | David Hirth | 2004-01-06 |
| 6571869 | Downhole surge pressure reduction and filtering apparatus | Clayton Stanley Pluchek, Richard L. Giroux, Thad Scott, David M. Haugen | 2003-06-03 |
| 4753356 | Transfer cart with improved base and gate guides | Harold L. Nootenboom, Ronald L. Rosa | 1988-06-28 |
| 4732172 | Apparatus for washing transfer carts | — | 1988-03-22 |
| 4610413 | Pegbar display device | — | 1986-09-09 |