Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4884030 | Method and system for acquisition and separation of the effects of electromagnetic fields to predict earthquakes | Simon Spitz | 1989-11-28 |
| 4874060 | Device for receiving sound waves in a well | Philippe Guerendel, Jean Laurent, Pascal Dedole | 1989-10-17 |
| 4796723 | System for transmitting energy through an apparatus usable for subsoil prospection, lowered inside a well or drill hole | Jean Laurent, Rene Paterna | 1989-01-10 |