Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9383139 | Sulfur melting system and method | Roy Anthony Pickren, Roger Jacques Maduell | 2016-07-05 |
| 7097386 | Simultaneous development of underground caverns and deposition of materials | Roger Jacques Maduell, David Landry | 2006-08-29 |