Issued Patents 2004
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6768307 | Flux plane locating in an underground drilling system | Albert W. Chau, John E. Mercer | 2004-07-27 |
| 6756783 | Multi-frequency boring tool locating system and method | John E. Mercer | 2004-06-29 |
| 6737867 | Locating arrangement and method using boring tool and cable locating signals | Albert W. Chau, John E. Mercer | 2004-05-18 |
| 6727704 | Boring tool tracking/guiding system and method with unconstrained target location geometry | John E. Mercer, Albert W. Chau | 2004-04-27 |