Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4920089 | Hydrogenation catalyst | Wilhelmus P. Van Beek, Wilma Den Hoed, Willem A. Van Leeuwen, Cornelis Visser | 1990-04-24 |
| 4665048 | Catalyst suitable for hydrotreating | Willem A. Van Leeuwen, Leendert H. Staal, Dirk Verzijl | 1987-05-12 |