Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5732746 | Multilayer pipe and die for manufacturing it | Jean Marie Louis Leroy | 1998-03-31 |
| 5334360 | Apparatus for continuous production of tetraphosphorus polysulfides | Philippe Engel | 1994-08-02 |
| 5198202 | Continuous production of tetraphosphorus polysulfides | Philippe Engel | 1993-03-30 |