Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8834224 | Method of manufacturing metal shell assembly for spark plug, method of manufacturing spark plug, and apparatus for manufacturing metal shell assembly for spark plug | Atsushi Ozeki, Takashi Tamada | 2014-09-16 |
| 8636555 | Manufacturing apparatus and manufacturing method for spark plugs | Jiro Kyuno | 2014-01-28 |
| 8371889 | Spark plug manufacturing method and spark plug manufacturing apparatus | Masahiro Enuma | 2013-02-12 |