Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10399823 | Conveyor drive unit with initialization of the adaptive power supply unit and identification of the motor | — | 2019-09-03 |
| 8264538 | Optically monitoring comb-line of escalators and moving walks | Herbert K. Horbruegger | 2012-09-11 |
| 6782989 | Process for switching between mains supply and a frequency inverter and vice versa | Stefan Spannhake, Herbert Horbrugger | 2004-08-31 |
| 6626279 | Process for switching between main supply and a frequency inverter and vice versa for an escalator drive | Stefan Spannhake, Ralph S. Stripling, Richard Markus | 2003-09-30 |
| 6267219 | Electronic safety system for escalators | Stefan Spannhake, Jurgen Gewinner | 2001-07-31 |