Issued Patents All Time
Showing 1–17 of 17 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |