Issued Patents All Time
Showing 76–100 of 109 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7304479 | Flux plane locating in an underground drilling system | Albert W. Chau, John E. Mercer | 2007-12-04 |
| 7218116 | Boring tool tracking/guiding system and method with unconstrained target location geometry | John E. Mercer, Albert W. Chau | 2007-05-15 |
| 7209093 | Locating technique and apparatus using an approximated dipole signal | John E. Mercer, Albert W. Chau, Rudolf Zeller | 2007-04-24 |
| 7176690 | Flux plane locating in an underground drilling system | Albert W. Chau, John E. Mercer | 2007-02-13 |
| 7165632 | Boring tool tracking fundamentally based on drill string length, pitch and roll | James W. Burrows, John E. Mercer | 2007-01-23 |
| 7159672 | Mapping tool for tracking and/or guiding an underground boring tool | John E. Mercer, Peter H. Hambling, Rudolf Zeller, Shiu S. Ng, Lloyd A. Moore | 2007-01-09 |
| 7084636 | Boring tool tracking/guiding system and method with unconstrained target location geometry | John E. Mercer, Albert W. Chau | 2006-08-01 |
| 7080698 | Mapping tool for tracking and/or guiding an underground boring tool | John E. Mercer, Peter H. Hambling, Rudolf Zeller, Shiu S. Ng, Lloyd A. Moore | 2006-07-25 |
| 7021403 | Method of 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 | 2006-04-04 |
| 7015697 | Multi-frequency boring tool locating system and method | John E. Mercer | 2006-03-21 |
| 6975119 | Boring tool tracking/guiding system and method with unconstrained target location geometry | John E. Mercer, Albert W. Chau | 2005-12-13 |
| 6963201 | Flux plane locating in an underground drilling system | Albert W. Chau, John E. Mercer | 2005-11-08 |
| 6927741 | Locating technique and apparatus using an approximated dipole signal | John E. Mercer, Albert W. Chau, Rudolf Zeller | 2005-08-09 |
| 6920943 | Mapping tool for tracking and/or guiding an underground boring tool | John E. Mercer, Peter H. Hambling, Rudolf Zeller, Shiu S. Ng, Lloyd A. Moore | 2005-07-26 |
| 6917202 | Boring tool tracking/guiding system and method with unconstrained target location geometry | John E. Mercer, Albert W. Chau | 2005-07-12 |
| 6868921 | Boring tool tracking fundamentally based on drill string length, pitch and roll | James W. Burrows, John E. Mercer | 2005-03-22 |
| 6856135 | Boring tool tracking/guiding system and method with unconstrained target location geometry | John E. Mercer, Albert W. Chau | 2005-02-15 |
| 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 |
| 6668944 | Path mapping in underground boring tool applications | Peter H. Hambling, John E. Mercer, Lloyd A. Moore, Shiu S. Ng, Rudolf Zeller | 2003-12-30 |
| 6653837 | Dipole field locate point determination using a horizontal flux vector | Albert W. Chau, John E. Mercer | 2003-11-25 |
| 6640907 | Mapping tool for tracking and/or guiding an underground boring tool | John E. Mercer, Peter H. Hambling, Rudolf Zeller, Shiu S. Ng, Lloyd A. Moore | 2003-11-04 |
| 6536538 | 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 | 2003-03-25 |