Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4799139 | Voltage regulation for three-phase inverters | Matti Kahkipuro, Urpo Sten, Pekka Hytti | 1989-01-17 |
| 4737900 | Method of and apparatus for controlling the braking resistor of a frequency converter | Matti Kahkipuro, Harri Hakala, Urpo Sten | 1988-04-12 |