Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5093000 | Filtration apparatus | Johannes P. P. Tholen | 1992-03-03 |
| 5089096 | Preparation of quaternary ammonium hydroxides | Johannes P. P. Tholen, Hendricus J. H. Van Der Maas, Gosse Boxhoorn | 1992-02-18 |