Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4560463 | Gas sensor, particularly oxygen sensor exposed to combustion exhaust gases | Thomas Frey, Werner Grunwald, Helmut Weyl | 1985-12-24 |
| 4418661 | Glow plug, particularly for diesel engine | Friedrich Esper, Thomas Frey, Heinz Geier, Gerhard Holfelder | 1983-12-06 |