Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7252160 | Electromagnetic gap sub assembly | Tony Dopf, Derek W. Logan, Paul L. Camwell, Michael Nero, Clemens Horst | 2007-08-07 |
| 7093680 | Subsurface signal transmitting apparatus | Marvin L. Holbert, James W. Haslett, Frederick N. Trofimenkoff | 2006-08-22 |
| 6672383 | Subsurface signal transmitting apparatus | Marvin L. Holbert, James W. Haslett, Frederick N. Trofimenkoff | 2004-01-06 |
| 6405795 | Subsurface signal transmitting apparatus | Marvin L. Holbert, James W. Haslett, Frederick N. Trofimenkoff | 2002-06-18 |
| 6209632 | Subsurface signal transmitting apparatus | Marvin L. Holbert, James W. Haslett, Frederick N. Trofimenkoff | 2001-04-03 |