Issued Patents 2003
Showing 1–1 of 1 patents
| 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, Gunter Blechschmidt, Peter Walden, Robert Oesterle | 2003-10-21 |