Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5660238 | Switch actuator and flow restrictor pilot valve assembly for measurement while drilling tools | Borislav J. Tchakarov | 1997-08-26 |
| 5348091 | Self-adjusting centralizer | Borislav J. Tchakarov | 1994-09-20 |
| 5103430 | Mud pulse pressure signal generator | John D. Jeter, Merlin P. Landry | 1992-04-07 |