Issued Patents 2003
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6644422 | Pantograph underreamer | Monty H. Rial, Harold E. Payne | 2003-11-11 |
| 6595301 | Single-blade underreamer | Joseph A. Zupanick, Harold E. Payne | 2003-07-22 |
| 6595302 | Multi-blade underreamer | Harold E. Payne | 2003-07-22 |
| 6591922 | Pantograph underreamer and method for forming a well bore cavity | Monty H. Rial, Harold E. Payne | 2003-07-15 |
| 6575255 | Pantograph underreamer | Monty H. Rial, Harold E. Payne | 2003-06-10 |