Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7946392 | Drive for an elevator door with a displacement curve adapted to the air flows in the shaft | — | 2011-05-24 |
| 7398863 | Safety device for elevators | Christoph Liebetrau, Ruedi Stocker | 2008-07-15 |