Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4278138 | Composite heavy metal drill collar | David S. Rowley, James T. Aumann | 1981-07-14 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4278138 | Composite heavy metal drill collar | David S. Rowley, James T. Aumann | 1981-07-14 |