Issued Patents 2019
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10443316 | Drill string adapter and method for inground signal coupling | Albert W. Chau | 2019-10-15 |
| 10323506 | Sonde with integral pressure sensor and method | Albert W. Chau, Dmitry Feldman | 2019-06-18 |