Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6634442 | Process for using biodegradable drilling muds | Josiane Durrieu, Christian Zurdo, Alain Rabion, Laurent Fraisse | 2003-10-21 |
| 6426321 | Biodegradable drilling mud and process for its preparation | Josiane Durrieu, Anne Basseres, Christian Zurdo | 2002-07-30 |
| 5120449 | Treatment of aqueous drilling mud effluents containing lignosulfonates | Pierre Mountetou, Bernard Gastou | 1992-06-09 |