Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5398979 | Seal for manholes and drains | Joel Duval | 1995-03-21 |
| 4495688 | Prefabricated concrete panel with truss | François Longpré, Yves Longpre | 1985-01-29 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5398979 | Seal for manholes and drains | Joel Duval | 1995-03-21 |
| 4495688 | Prefabricated concrete panel with truss | François Longpré, Yves Longpre | 1985-01-29 |