Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6241029 | Earth formation surveying device | Josef Guillaume Christoffel Coenen | 2001-06-05 |
| 6167964 | Method of determining in-situ stresses | Cornelis Jan Kenter, Johannes Gerardus Van Munster | 2001-01-02 |