Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5163523 | Screw thread structure for percussion drill driver sub and case | Faisal J. Yousef, Robert F. Kane, David Mildren | 1992-11-17 |
| 5060740 | Screw thread coupling | Faisal J. Yousef, Robert F. Kane, David Mildren | 1991-10-29 |
| 5056611 | Screw thread structure | Faisal J. Yousef, Robert F. Kane, David Mildren | 1991-10-15 |