Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4860825 | Device for positioning a tool or instrument in a duct | Jacques Corteville, Frederic Hoffmann | 1989-08-29 |
| 4803874 | Device and method for determining the orientation of fractures in a geological formation | Jacques Marrast, Christian Wittrisch | 1989-02-14 |