Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4896733 | Technique for providing an underground tunnel utilizing a powered boring device | Albert W. Chau, James A. Fikse, John E. Mercer | 1990-01-30 |
| 4867255 | Technique for steering a downhole hammer | Dmitry Feldman, Shiu S. Ng, Albert W. Chau, John E. Mercer | 1989-09-19 |
| 4856600 | Technique for providing an underground tunnel utilizing a powered boring device | Albert W. Chau, James A. Fikse, John E. Mercer | 1989-08-15 |
| 4821815 | Technique for providing an underground tunnel utilizing a powered boring device | Albert W. Chau, James A. Fikse, John E. Mercer | 1989-04-18 |
| 4714118 | Technique for steering and monitoring the orientation of a powered underground boring device | Albert W. Chau, John E. Mercer | 1987-12-22 |