Issued Patents 2011
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8047306 | Top drive drilling system and other applications using a low speed direct drive AC motor | Alvie E. Howard, Jr., Daniel F. McNease, Rudy Harris, Richard O. Bradley | 2011-11-01 |
| 7923946 | Flywheel-based energy storage on a heave-compensating drawworks | — | 2011-04-12 |