Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9608412 | Spark plug having long service life | Detlef Hartmann, Andreas Benz, Jochen Fischer | 2017-03-28 |
| 7977856 | Spark plug incorporating a folded packing situated on an outer circumference of a housing for position-oriented installation | Detlef Hartmann, Christoph Naumann, Jochen Fischer | 2011-07-12 |