Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880082 | Method for determining the position of an elevator car and a pulse count based floor selector | Matti Kahkipuro, Jouko Perttula | 1989-11-14 |
| 4672277 | Elevator motor control | Matti Kahkipuro | 1987-06-09 |
| 4621222 | Method for improving the dynamic converter drive for a direct current elevator motor | Matti Kahkipuro | 1986-11-04 |
| 4518062 | Procedure and measuring circuit for stopping an elevator | Seppo Suur-Askola | 1985-05-21 |
| 4499972 | Speed control system for a motor with short-circuited rotor | Seppo Suur-Askola | 1985-02-19 |
| 4380049 | Method and apparatus for stopping an elevator | — | 1983-04-12 |
| 4355704 | Procedure for fine positioning an alternating current lift | — | 1982-10-26 |