Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5038745 | Ignition unit for internal combustion engines | Alfred Krappel, Josef Holzmann, 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, Josef Holzmann | 1990-04-03 |
| 4509482 | Electronically controlled ignition system | Willy Minner, Alfred Krappel | 1985-04-09 |
| 4506643 | Ignition system for internal combustion engines | Alfred Krappel, Josef Holzmann | 1985-03-26 |
| 4363304 | Engine ignition system with anti-knock timing shift | Adolf Fritz, Michael Gottschick, Alfred Krappel | 1982-12-14 |