Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6648073 | Retrievable sliding sleeve flow control valve for zonal isolation control system | Phillip S. Sizer, Mark Crawford | 2003-11-18 |
| 6419022 | Retrievable zonal isolation control system | Mark Crawford | 2002-07-16 |
| 4454913 | Safety valve system with retrievable equalizing feature | Shelby L. Guidry | 1984-06-19 |