Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874060 | Device for receiving sound waves in a well | Philippe Guerendel, Charles Naville, Pascal Dedole | 1989-10-17 |
| 4796723 | System for transmitting energy through an apparatus usable for subsoil prospection, lowered inside a well or drill hole | Charles Naville, Rene Paterna | 1989-01-10 |