Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5372207 | Seismic prospecting method and device using a drill bit working in a well | Philippe Staron, Guy Pignard, Christian Wittrisch | 1994-12-13 |
| 5305285 | Method and apparatus for subsoil exploration including emission of a series of seismic impulses | Hubert Japiot | 1994-04-19 |