Issued Patents 2011
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8011450 | Active bottomhole pressure control with liner drilling and completion systems | Sven Krueger, Gerald Heisig, Detlef Hahn, Volker Krueger, Harald Grimmer +2 more | 2011-09-06 |
| 7931098 | Steerable bit system assembly and methods | Roger Fincher, Larry Watkins | 2011-04-26 |