Issued Patents 2019
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |