Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7172021 | Liner hanger with sliding sleeve valve | David Paul Brisco, Edwin Zwald, Gregory Marshall Noel, William J. Dean, Andrei Gregory Filippov +6 more | 2007-02-06 |
| 6976541 | Liner hanger with sliding sleeve valve | David Paul Brisco, Edwin Zwald, Gregory Marshall Noel, William J. Dean, Andrei Gregory Filippov +6 more | 2005-12-20 |