Issued Patents 2003
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6655464 | Auto-extending/retracting electrically isolated conductors in a segmented drill string | John E. Mercer | 2003-12-02 |
| 6653837 | Dipole field locate point determination using a horizontal flux vector | Guenter W. Brune, John E. Mercer | 2003-11-25 |
| 6617854 | Tracking the positional relationship between a boring tool and one or more buried lines using a composite magnetic signal | John E. Mercer | 2003-09-09 |