Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5649597 | Differential pressure test/bypass valve and method for using the same | — | 1997-07-22 |
| 5597016 | Mechanical lockout for pressure responsive downhole tool | Kevin R. Manke | 1997-01-28 |