Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4813601 | Piezoelectric control valve for controlling fuel injection valve in internal-combustion engines | Karl Kirschenhofer | 1989-03-21 |
| 4796662 | Valve arrangement with main shifting valve and pilot control valve | Ruediger Hoffmann, Dieter Feichtiger | 1989-01-10 |