Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4875910 | Filter for removing cancer causing compounds from exhaust fumes | Hugues Menard | 1989-10-24 |
| 4810280 | Method for enhancing water retention in soil | Raymond Le Van Mao, Gerald P. McLaughlin, Pierre Levesque | 1989-03-07 |