Issued Patents 2004
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6831397 | Spark plug and a method of producing the same | Tsunenobu Hori | 2004-12-14 |
| 6819033 | Spark plug and method of manufacturing same | Masayuki Tamura | 2004-11-16 |
| 6794804 | Production method of spark plug designed to provide high temperature oxidation resistance and weld strength and spark plug produced thereby | Tsunenobu Hori | 2004-09-21 |
| 6724132 | Spark plug for an engine for a cogeneration system | — | 2004-04-20 |
| 6700317 | Spark plug for an internal combustion engine and manufacturing method of the same | Kouzou Takamura | 2004-03-02 |