Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4592803 | Device for making alkali metal phosphates by spraying alkali metal phosphate solutions or suspensions | Jan Drijver, Hans Kinneging, Hans Scheffer, Jaap Stam, Paul de Witte | 1986-06-03 |
| 4534946 | Process for making alkali metal polyphosphates | Hans Scheffer, Paul de Witte, Johannes Krause, Hans Haas, Werner Kowalski | 1985-08-13 |
| 4501639 | Process and device for making alkali metal phosphates by spraying alkali metal phosphate solutions or suspensions | Jan Drijver, Hans Kinneging, Hans Scheffer, Jaap Stam, Paul de Witte | 1985-02-26 |