Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6305469 | Method of creating a wellbore | Josef Guillaume Christoffel Coenen | 2001-10-23 |
| 4682421 | Method for determining the azimuth of a borehole | Johannes Cornelis Maria Van Dongen | 1987-07-28 |