Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8157015 | Large bore vertical tree | Robert K. Voss, David S. Christie | 2012-04-17 |
| 8011436 | Through riser installation of tree block | David S. Christie, Robert K. Voss | 2011-09-06 |
| 5129459 | Subsea flowline selector | Stanley Hosie | 1992-07-14 |
| 4869535 | Submerged actuator | — | 1989-09-26 |
| 4751836 | Pipe end conditioner and method | — | 1988-06-21 |