Issued Patents All Time
Showing 1–25 of 109 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12188346 | Advanced underground homing system, apparatus and method | John E. Mercer, Albert W. Chau | 2025-01-07 |
| 11598198 | Advanced underground homing system, apparatus and method | John E. Mercer, Albert W. Chau | 2023-03-07 |
| 11480446 | Tracking positions of personnel, vehicles, and inanimate objects | Rudolf Zeller, Albert W. Chau, John E. Mercer | 2022-10-25 |
| 11118442 | Boring tool tracking fundamentally based on drill string length, pitch and roll | James W. Burrows, John E. Mercer | 2021-09-14 |
| 11035218 | Advanced steering tool system, method and apparatus | Albert W. Chau, Rudolf Zeller, John E. Mercer | 2021-06-15 |
| 10895145 | Advanced underground homing system, apparatus and method | John E. Mercer, Albert W. Chau | 2021-01-19 |
| 10809099 | Tracking positions of personnel, vehicles, and inanimate objects | Rudolf Zeller, Albert W. Chau, John E. Mercer | 2020-10-20 |
| 10746892 | System for determining offset and orientation from a planar loop antenna | John E. Mercer, Albert W. Chau, Rudolf Zeller | 2020-08-18 |
| 10738588 | Boring tool tracking fundamentally based on drill string length, pitch and roll | James W. Burrows, John E. Mercer | 2020-08-11 |
| 10584573 | Advanced steering tool system, method and apparatus | Albert W. Chau, Rudolf Zeller, John E. Mercer | 2020-03-10 |
| 10422664 | Tracking positions of personnel, vehicles, and inanimate objects | Rudolf Zeller, Albert W. Chau, John E. Mercer | 2019-09-24 |
| 10378334 | Flux plane locating in an underground drilling system | Albert W. Chau, John E. Mercer | 2019-08-13 |
| 10273796 | Advanced steering tool system, method and apparatus | Albert W. Chau, Rudolf Zeller, John E. Mercer | 2019-04-30 |
| 10254425 | Locating arrangement and method using boring tool and cable locating signals | Albert W. Chau, John E. Mercer | 2019-04-09 |
| 10246985 | Boring tool tracking fundamentally based on drill string length, pitch and roll | James W. Burrows, John E. Mercer | 2019-04-02 |
| 10107090 | Advanced underground homing system, apparatus and method | John E. Mercer, Albert W. Chau | 2018-10-23 |
| 10107091 | Flux plane locating in an underground drilling system | Albert W. Chau, John E. Mercer | 2018-10-23 |
| 10094946 | Transmitter using a planar loop antenna for generating a locating signal | John E. Mercer, Albert W. Chau, Rudolf Zeller | 2018-10-09 |
| 9915747 | Inground transmitter with roll orientation pattern based frequency change | John E. Mercer | 2018-03-13 |
| 9798032 | Locating arrangement and method using boring tool and cable locating signals | Albert W. Chau, John E. Mercer | 2017-10-24 |
| 9777567 | Advanced steering tool system, method and apparatus | Albert W. Chau, Rudolf Zeller, John E. Mercer | 2017-10-03 |
| 9683436 | Flux plane locating in an underground drilling system | Albert W. Chau, John E. Mercer | 2017-06-20 |
| 9581717 | Receiver using an approximated dipole signal | John E. Mercer, Albert W. Chau, Rudolf Zeller | 2017-02-28 |
| 9519074 | Flux plane locating in an underground drilling system | Albert W. Chau, John E. Mercer | 2016-12-13 |
| 9513397 | Tone detection apparatus and method | John E. Mercer | 2016-12-06 |