Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12428345 | Fire retardant construction materials | — | 2025-09-30 |
| 10392308 | Fire retardant construction materials | — | 2019-08-27 |
| 7993756 | Long-chain quaternary ammonium compounds as wood treatment agents | Lehong Jin, Alan F. Preston, Kevin Archer, Andrew R. Zahora, Paul Walcheski | 2011-08-09 |
| 7850771 | Emulsion compositions for wood protection | Alan F. Preston | 2010-12-14 |
| 7264886 | Water repellent compositions for wood preservatives | Alan F. Preston, Kevin Archer, Paul Walcheski | 2007-09-04 |
| 6274199 | Wood treatment process | Alan F. Preston, Andrew R. Zahora | 2001-08-14 |
| 5698829 | Photodegradation of toxic contaminants | John N. R. Ruddick | 1997-12-16 |
| 5476975 | Extraction of toxic organic contaminants from wood and photodegradation of toxic organic contaminants | John N. R. Ruddick | 1995-12-19 |