Issued Patents All Time
Showing 26–31 of 31 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |
| 6653766 | Spark plug and method of manufacturing same | — | 2003-11-25 |
| 6603246 | Spark plug used for cogeneration purpose and adjusting method for discharging gap thereof | — | 2003-08-05 |
| 6346766 | Spark plug for internal combustion engine and method for manufacturing same | Keiji Kanao | 2002-02-12 |