Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10308479 | Elevator installation | Holger Zerelles, Bernd Altenburger, Juri Schäfer | 2019-06-04 |
| 10183842 | Elevator installation | Jörg Müller, Holger Zerelles, Bernd Altenburger, Juri Schäfer | 2019-01-22 |
| 9834410 | Elevator installation | Holger Zerelles, Bernd Altenburger, Juri Schäfer | 2017-12-05 |
| 9783391 | Elevator installation | Holger Zerelles, Bernd Altenburger, Juri Schäfer | 2017-10-10 |