Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8540092 | Hoisting crane with annular bearing structure | Joop Roodenburg, Gerrit Van Wijk | 2013-09-24 |
| 6926259 | Hoist system | Joop Roodenburg | 2005-08-09 |
| 6595494 | Hoisting device, with compensator built into hoisting cable system | Joop Roodenburg | 2003-07-22 |