Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6834722 | Cyclic check valve for coiled tubing | John Ravensbergen, John Misselbrook | 2004-12-28 |
| 6832654 | Bottom hole assembly | John Ravensbergen, Andre Naumann, Mitch Lambert, Graham Wilde | 2004-12-21 |