Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6496008 | Flux plane locating in an underground drilling system | Guenter W. Brune, John E. Mercer | 2002-12-17 |
| 6446728 | Auto-extending/retracting electrically isolated conductors in a segmented drill string | John E. Mercer | 2002-09-10 |