Issued Patents 2004
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6794802 | Spark plug for an internal combustion engine and method for producing a spark plug | — | 2004-09-21 |
| 6699807 | Glass ceramic material, method for producing the same and spark plug containing such a glass ceramic material | Heinz Geier, Imke Koengeter, Ulrich Eisele | 2004-03-02 |
| 6693053 | Glass and glass powder mixture and use thereof for the production of a glass ceramic | Heinz Geier, Ulrich Eisele, Peter Wange | 2004-02-17 |