Issued Patents 2003
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6659184 | Multi-line back pressure control system | Timothy R. Tips, Richard P. Rubbo | 2003-12-09 |
| 6575237 | Hydraulic well control system | Daniel George Purkis | 2003-06-10 |
| 6567013 | Digital hydraulic well control system | Daniel George Purkis | 2003-05-20 |