Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6550327 | Device for measuring the density of a flowing medium | — | 2003-04-22 |
| 6499239 | Method for extracting and grading sand | Sjerp Zeldenrust | 2002-12-31 |
| 5979088 | Dredging installation | Jan Brouwer | 1999-11-09 |
| 5913604 | Dredging installation | Jan Brouwer | 1999-06-22 |
| 4470208 | Dredge with adjustable bottom support for suction pipe and method | Jan Brouwer | 1984-09-11 |