Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6918440 | Testing drill packer | Timothy R. Carlson, Chuck MacPhail, Imre I. Gazda | 2005-07-19 |
| 6668936 | Hydraulic control system for downhole tools | Jimmie R. Williamson, Jr., Perry C. Shy, Leo G. Collins | 2003-12-30 |
| 6125938 | Control module system for subterranean well | Kenneth L. Schwendemann | 2000-10-03 |
| 6026905 | Subsea test tree and methods of servicing a subterranean well | — | 2000-02-22 |
| 5894890 | Normally closed retainer valve with fail-safe pump through capability | Darrin N. Towers, Kenneth L. Schwendemann | 1999-04-20 |
| 5884707 | Normally closed retainer valve with fail-safe pump through capability | Darrin N. Towers, Kenneth L. Schwendemann | 1999-03-23 |
| 5884703 | Normally closed retainer valve with fail-safe pump through capability | Darrin N. Towers, Kenneth L. Schwendemann | 1999-03-23 |
| 5884708 | Normally closed retainer valve with fail-safe pump through capability | Darrin N. Towers, Kenneth L. Schwendemann | 1999-03-23 |
| 5803170 | Well line protective apparatus | Kenneth L. Schwendemann | 1998-09-08 |
| 5782304 | Normally closed retainer valve with fail-safe pump through capability | Darrin N. Towers, Kenneth L. Schwendemann | 1998-07-21 |