Issued Patents All Time
Showing 1–25 of 27 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9679727 | Switch assembly | Marko Takala, Jari Elomaa, Veikko Puumala, Lauri Kettunen, Tommi Forsberg +3 more | 2017-06-13 |
| 8471403 | Power supply arrangement of an elevator | Joni Tähtinen, Jari Helvilä, Pekka Hytti | 2013-06-25 |
| 6305501 | Elevator reluctance linear motor drive system | Raimo Pelto-Huikko, Antti Kallioniemi | 2001-10-23 |
| 5679934 | Programmable operating panel for an elevator car | Asko Juntunen | 1997-10-21 |
| 5523937 | Frequency converter, procedure for controlling it and motor control using a frequency converter | — | 1996-06-04 |
| 5220981 | Elevator and a procedure for its control | Jouko Perttula | 1993-06-22 |
| 5194797 | Procedure for the regulation of an asynchronous motor | — | 1993-03-16 |
| 5042621 | Method and apparatus for the measurement and tuning of an elevator system | Seppo Ovaska | 1991-08-27 |
| 5027925 | Procedure and apparatus for damping the vibrations of an elevator car | — | 1991-07-02 |
| 4894765 | Bi-directional d.c./d.c. converter compatible with an inverter bridge | — | 1990-01-16 |
| 4880082 | Method for determining the position of an elevator car and a pulse count based floor selector | Heimo Makinen, Jouko Perttula | 1989-11-14 |
| 4804067 | Inverter control apparatus for elevator motor | — | 1989-02-14 |
| 4799139 | Voltage regulation for three-phase inverters | Urpo Sten, Pekka Nummi, Pekka Hytti | 1989-01-17 |
| 4791346 | Elevator motor control | — | 1988-12-13 |
| 4774650 | Method for directing power between three-phase mains and a d.c. circuit | Harri Hakala | 1988-09-27 |
| 4753323 | Safety system for closing doors | — | 1988-06-28 |
| 4742893 | Signalling procedure for a lift and a signalling system | Matti Otala, Osmo Ivanto, Urpo Sten | 1988-05-10 |
| 4737900 | Method of and apparatus for controlling the braking resistor of a frequency converter | Harri Hakala, Pekka Nummi, Urpo Sten | 1988-04-12 |
| 4684856 | Method and drive for elevator DC drive motor stabilization | — | 1987-08-04 |
| 4672277 | Elevator motor control | Heimo Makinen | 1987-06-09 |
| 4663700 | Way of placing chokes with air core | — | 1987-05-05 |
| 4635320 | Floor selector for lift | Pekka Hakkinen | 1987-01-13 |
| 4621222 | Method for improving the dynamic converter drive for a direct current elevator motor | Heimo Makinen | 1986-11-04 |
| 4466053 | Thyristor converter drive | Risto Kontturi, Pertti Saransaari | 1984-08-14 |
| 4414619 | Procedure and apparatus for switching thyristor bridges in static alternating current/direct conversion | — | 1983-11-08 |