Issued Patents 2011
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7926569 | Bypass device for wellbores | William John Darnell, William Ryle Darnell, Rodney Wayne Long, Todd Ulrich Chretien | 2011-04-19 |
| 7926595 | Filter sub | William John Darnell, William Ryle Darnell, Rodney Wayne Long, Todd Ulrich Chretien | 2011-04-19 |
| 7921922 | Formation saver sub and method | William John Darnell, Rodney Wayne Long | 2011-04-12 |