Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9932477 | Roofing asphalt composition | Hua Liu, Rene Dufresne | 2018-04-03 |
| 9279042 | Method of the production of a roofing asphalt composition using catalytic oxidation | Hua Liu, Rene Dufresne | 2016-03-08 |