Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6550585 | Hoistway intrusion detection | Wolfgang Schoppa | 2003-04-22 |
| 5306882 | Measuring elevator hoistway position using audible signals | Lutz Vietze, Claudia M. Schmidt-Milkau | 1994-04-26 |