Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6440225 | Floor treating method and machine | Michael Van Den Burg, Josef Jans, Frederik J. Schepers, Rolf Semmler | 2002-08-27 |
| 4607137 | Method of distributing and utilizing enciphering keys | Cornelis J. A. Jansen, Andries J. M. van de Pas, Frederik Hafkamp | 1986-08-19 |