Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4267483 | Insulator on spark plug electrode coated with zirconium and vanadium oxides | Koichi Nakajima, Tomoji Ishiguro, Tokuhiko Okamoto, Minoru Nagai, Kanji Higuchi +1 more | 1981-05-12 |
| 4250426 | Spark plug having vanadium oxide islands on central insulator | Koichi Nakajima, Tomoji Ishiguro, Tokuhiko Okamoto, Minoru Nagai, Kanji Higuchi +1 more | 1981-02-10 |