Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4867255 | Technique for steering a downhole hammer | Glen Baker, Shiu S. Ng, Albert W. Chau, John E. Mercer | 1989-09-19 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4867255 | Technique for steering a downhole hammer | Glen Baker, Shiu S. Ng, Albert W. Chau, John E. Mercer | 1989-09-19 |