Issued Patents 2021
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11136881 | Advanced inground operations, system, communications and associated apparatus | Albert W. Chau, Craig Caswell | 2021-10-05 |
| 11105161 | Drill string adapter and method for inground signal coupling | Albert W. Chau | 2021-08-31 |
| 11060355 | Directional drilling target steering apparatus and method | Bruce Kolpack, David Bahr, Thomas J. Hall | 2021-07-13 |