Issued Patents 2004
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6822378 | Glaze layer for a spark plug | Kenichi Nishikawa | 2004-11-23 |
| 6771009 | Spark plug | Kenichi Nishikawa, Yoshihide Kouge | 2004-08-03 |
| 6765340 | Spark plug | Kenichi Nishikawa | 2004-07-20 |
| 6752677 | Method for producing spark plug | Kenichi Nishikawa | 2004-06-22 |
| 6688932 | Method for manufacturing spark plug and caulking metallic mold | Hiroaki Nasu, Wataru Matsutani, Yoshito Uemura, Hirohito Ito | 2004-02-10 |