Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4888676 | Damping circuit for turn-off valves | — | 1989-12-19 |
| 4800481 | Static converter circuit and method for controlling it | Berislav Knaffl, Peter Knapp, Alfred Rufer, Birger Gotaas | 1989-01-24 |