Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5979498 | Three-way or multi-way valve | Siegfried Zenker, Jens J.o slashed.rgen Nielsen | 1999-11-09 |
| 5947441 | Two-way seat-type valve | Siegfried Zenker, Jens J.o slashed.rgen Nielsen | 1999-09-07 |
| 5678604 | Fast opening, slow closing, relief valve | Erik Haugaard | 1997-10-21 |
| 5647394 | Control valve | Anders Valbj.o slashed.rn, Siegfried Zenker | 1997-07-15 |