Issued Patents All Time
Showing 51–75 of 109 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7990152 | Locating arrangement and method using boring tool and cable locating signals | Albert W. Chau, John E. Mercer | 2011-08-02 |
| 7967080 | Boring tool tracking fundamentally based on drill string length, pitch and roll | James W. Burrows, John E. Mercer | 2011-06-28 |
| 7960973 | Tracking positions of personnel, vehicles, and inanimate objects | Rudolf Zeller, Albert W. Chau, John E. Mercer | 2011-06-14 |
| 7956614 | Flux plane locating in an underground drilling system | Albert W. Chau, John E. Mercer | 2011-06-07 |
| 7898494 | Locating technique and apparatus using an approximated dipole signal | John E. Mercer, Albert W. Chau, Rudolf Zeller | 2011-03-01 |
| 7859249 | Tracking positions of personnel, vehicles, and inanimate objects | Rudolf Zeller, Albert W. Chau, John E. Mercer | 2010-12-28 |
| 7834631 | Locating arrangement and method using boring tool and cable locating signals | Albert W. Chau, John E. Mercer | 2010-11-16 |
| 7775301 | Advanced steering tool system, method and apparatus | Albert W. Chau, Rudolf Zeller, John E. Mercer | 2010-08-17 |
| 7772849 | Tracking positions of personnel, vehicles, and inanimate objects | Rudolf Zeller, Albert W. Chau, John E. Mercer | 2010-08-10 |
| 7768265 | Flux plane locating in an underground drilling system | Albert W. Chau, John E. Mercer | 2010-08-03 |
| 7743848 | Boring tool tracking fundamentally based on drill string length, pitch, and roll | James W. Burrows, John E. Mercer | 2010-06-29 |
| 7728595 | Multi-frequency in-ground locating signal frequency code identification and apparatus | John E. Mercer | 2010-06-01 |
| 7663371 | Flux plane locating in an underground drilling system | Albert W. Chau, John E. Mercer | 2010-02-16 |
| 7586307 | Locating arrangement and method using boring tool and cable locating signals | Albert W. Chau, John E. Mercer | 2009-09-08 |
| 7570060 | Tracking positions of personnel, vehicles, and inanimate objects | Rudolf Zeller, Albert W. Chau, John E. Mercer | 2009-08-04 |
| 7562722 | Method and apparatus for establishing the position of a sonde in a region using a single detector | Peter H. Hambling, John E. Mercer, Lloyd A. Moore, Shiu S. Ng, Rudolf Zeller | 2009-07-21 |
| 7548065 | Skin depth compensation for an in-ground transmitter | John E. Mercer | 2009-06-16 |
| 7472761 | Boring tool tracking fundamentally based on drill string length, pitch and roll | James W. Burrows, John E. Mercer | 2009-01-06 |
| 7443359 | Locating technique and apparatus using an approximated dipole signal | John E. Mercer, Albert W. Chau, Rudolf Zeller | 2008-10-28 |
| 7425829 | Tracking positions of personnel, vehicles, and inanimate objects | Rudolf Zeller, Albert W. Chau, John E. Mercer | 2008-09-16 |
| 7403013 | Boring tool tracking/guiding system and method with unconstrained target location geometry | John E. Mercer, Albert W. Chau | 2008-07-22 |
| 7391216 | Locating arrangement and method using boring tool and cable locating signals | Albert W. Chau, John E. Mercer | 2008-06-24 |
| 7347280 | Establishing positions of locating field detectors and path mapping in underground boring tool applications | Peter H. Hambling, John E. Mercer, Lloyd A. Moore, Shiu S. Ng, Rudolf Zeller | 2008-03-25 |
| 7327144 | Multi-frequency boring tool locating system and method | John E. Mercer | 2008-02-05 |
| 7306053 | Boring tool tracking fundamentally based on drill string length, pitch and roll | James W. Burrows, John E. Mercer | 2007-12-11 |