Issued Patents All Time
Showing 26–50 of 109 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9507046 | Locating arrangement and method using boring tool and cable locating signals | Albert W. Chau, John E. Mercer | 2016-11-29 |
| 9422804 | Advanced underground homing system, apparatus and method | John E. Mercer, Albert W. Chau | 2016-08-23 |
| 9371725 | Boring tool tracking fundamentally based on drill string length, pitch and roll | James W. Burrows, John E. Mercer | 2016-06-21 |
| 9360579 | Advanced steering tool system, method and apparatus | Albert W. Chau, Rudolf Zeller, John E. Mercer | 2016-06-07 |
| 9310507 | Tracking positions of personnel, vehicles, and inanimate objects | Rudolf Zeller, Albert W. Chau, John E. Mercer | 2016-04-12 |
| 9291738 | Flux plane locating in an underground drilling system | Albert W. Chau, John E. Mercer | 2016-03-22 |
| 9261621 | Locating arrangement and method using boring tool and cable locating signals | Albert W. Chau, John E. Mercer | 2016-02-16 |
| 9244189 | Advanced steering tool system, method and apparatus | Albert W. Chau, Rudolf Zeller, John E. Mercer | 2016-01-26 |
| 9133703 | Advanced steering tool system, method and apparatus | Albert W. Chau, Rudolf Zeller, John E. Mercer | 2015-09-15 |
| 9035656 | Tracking positions of personnel, vehicles, and inanimate objects | Rudolf Zeller, Albert W. Chau, John E. Mercer | 2015-05-19 |
| 8754648 | Boring tool locating signal frequency tracking apparatus | John E. Mercer | 2014-06-17 |
| 8686917 | Locating technique and apparatus using an approximated dipole signal | John E. Mercer, Albert W. Chau, Rudolf Zeller | 2014-04-01 |
| 8686731 | Tracking positions of personnel, vehicles, and inanimate objects | Rudolf Zeller, Albert W. Chau, John E. Mercer | 2014-04-01 |
| 8680864 | Flux plane locating in an underground drilling system | Albert W. Chau, John E. Mercer | 2014-03-25 |
| 8674700 | Locating arrangement and method using boring tool and cable locating signals | Albert W. Chau, John E. Mercer | 2014-03-18 |
| 8668030 | 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 | 2014-03-11 |
| 8659298 | Advanced steering tool system, method and apparatus | Albert W. Chau, Rudolf Zeller, John E. Mercer | 2014-02-25 |
| 8622150 | Boring tool tracking fundamentally based on drill string length, pitch and roll | James W. Burrows, John E. Mercer | 2014-01-07 |
| 8393414 | 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 | 2013-03-12 |
| 8381836 | Advanced underground homing system, apparatus and method | John E. Mercer, Albert W. Chau | 2013-02-26 |
| 8342262 | Boring tool tracking fundamentally based on drill string length, pitch and roll | James W. Burrows, John E. Mercer | 2013-01-01 |
| 8264419 | Locating technique and apparatus using an approximated dipole signal | John E. Mercer, Albert W. Chau, Rudolf Zeller | 2012-09-11 |
| 8157023 | Boring tool tracking fundamentally based on drill string length, pitch and roll | James W. Burrows, John E. Mercer | 2012-04-17 |
| 8025109 | Method for establishing the positions of a transmitter and detector in a region | Peter H. Hambling, John E. Mercer, Lloyd A. Moore, Shiu S. Ng, Rudolf Zeller | 2011-09-27 |
| 7990150 | Multifrequency locating arrangement with frequency designation | John E. Mercer | 2011-08-02 |