Issued Patents 2004
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6831397 | Spark plug and a method of producing the same | Keiji Kanao | 2004-12-14 |
| 6819031 | Spark plug and a method of producing the same | — | 2004-11-16 |
| 6794803 | Spark plug for an internal combustion engine | Yasutake Ishino, Hironori Osamura, Akira Mitsuhashi, Mineo Okuma | 2004-09-21 |
| 6794804 | Production method of spark plug designed to provide high temperature oxidation resistance and weld strength and spark plug produced thereby | Keiji Kanao | 2004-09-21 |
| 6750598 | Spark plug | — | 2004-06-15 |