Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6070700 | Operating system for elevator doors | — | 2000-06-06 |
| 5648644 | Brake regulating apparatus for an elevator car | — | 1997-07-15 |
| 5443140 | Method and apparatus for reducing the power required by an hydraulic elevator drive | Jorg Christians, Gerald Lechler | 1995-08-22 |
| 5373121 | Method and apparatus for saving electrical energy in an hydraulic elevator drive | — | 1994-12-13 |