Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6453862 | Ignition device for piston-type internal combustion engines | — | 2002-09-24 |
| 5038745 | Ignition unit for internal combustion engines | Alfred Krappel, Johannes Guggenmos, Georg Buchholz, Robert Tschuk | 1991-08-13 |
| 4914343 | Spark plug with counterelectrode having plural apertures in flat portion thereof | Junichi Kagawa, Wataru Matsutani, Alfred Krappel, Johannes Guggenmos | 1990-04-03 |
| 4506643 | Ignition system for internal combustion engines | Alfred Krappel, Johannes Guggenmos | 1985-03-26 |