Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7252153 | Bi-directional fluid loss device and method | David A. Hejl, W. David Henderson | 2007-08-07 |
| 7152688 | Positioning tool with valved fluid diversion path and method | — | 2006-12-26 |