Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8113286 | Downhole barrier valve | Clifford H. Beall, Michael J. May, James T. Sloan, Andrew S. Haynes | 2012-02-14 |
| 7967074 | Electric wireline insert safety valve | Gary B. Lake, Richard A. Patterson | 2011-06-28 |