| 10833901 |
Signal select in underground line location |
Stephen John Petherick, George Mainescu, Ion Dracea, Razvan Gabriel Stefanoiu |
2020-11-10 |
| 10338263 |
Signal processing for a cable locating instrument |
Stephen John Petherick |
2019-07-02 |
| 10310130 |
Cable detection apparatus with a comb filter |
Johan Overby |
2019-06-04 |
| 9473203 |
Signal select in underground line location |
Stephen John Petherick, George Mainescu, Ion Dracea, Razvan Gabriel Stefanoiu |
2016-10-18 |
| 8566043 |
Detector for calculating the distortion of an electromagnetic field produced by a buried current carrying conductor |
Richard David Pearson |
2013-10-22 |
| 8183851 |
Detector for calculating a depth of a buried conductor |
Richard David Pearson |
2012-05-22 |
| 8125210 |
Detector for calculating the depth of a buried conductor |
Richard David Pearson |
2012-02-28 |
| 8058874 |
System for and method of detecting a buried conductor |
Jeff Thompson |
2011-11-15 |
| 7994770 |
Transmitter of a system for detecting a buried conductor |
Richard David Pearson |
2011-08-09 |
| 7969137 |
System for and method of detecting a buried conductor |
— |
2011-06-28 |
| 7847556 |
Detector for detecting a buried current carrying conductor |
— |
2010-12-07 |
| 7567875 |
Enhanced sonde recognition |
— |
2009-07-28 |
| 7310584 |
Enhanced sonde recognition |
— |
2007-12-18 |
| 7184951 |
Methods and systems for generating phase-derivative sound |
James Ian King, Richard David Pearson |
2007-02-27 |
| 6968296 |
Cable detector with decimating filter and filtering method |
— |
2005-11-22 |
| 6642796 |
Digital phase-quadrature oscillator |
— |
2003-11-04 |
| 6617856 |
Electronic marker locator system and method |
Richard David Pearson |
2003-09-09 |