Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6634463 | Switch over from the mains supply to a frequency converter by a phase correction process for an escalator drive | Stefan Spannhake, Michael Mann, Peter Walden, Robert Oesterle, Michael Bernhard Kocur | 2003-10-21 |
| 5889238 | Deceleration time for an elevator car | Christoph M. Ernecke, Peter Herkel, Alberto Vecchiotti | 1999-03-30 |
| 5765664 | Elevator drive fault detector | Peter Herkel, Wolfgang Lutz Zemke | 1998-06-16 |