Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7771168 | Axial fan | Giorgio Cipelletti, Hendrik Fedde Van Der Spek | 2010-08-10 |
| 6499947 | Housing part for a ventilating fan | — | 2002-12-31 |
| 5683636 | Method of fan blade manufacture | Hendrik Fedde Van Der Spek | 1997-11-04 |