Issued Patents 2004
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |