Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12283796 | Spark plug | Natsuki Kurimoto, Naomichi Miyashita, Naoki Sakade | 2025-04-22 |
| RE35012 | Spark plug for internal combustion engines having an alloy layer between the electrodes and tip ends | Kozo Takamura, Yasuyuki Sato | 1995-08-08 |
| 4907256 | Exchange system having originating call restriction function | Mamoru Higuchi, Tatsuo Sunouchi, Hiroshi Saito, Minoru Maruyama | 1990-03-06 |
| 4581558 | Spark plug for internal combustion engines having an alloy layer between the electrodes and tip ends | Kozo Takamura, Yasuyuki Sato | 1986-04-08 |
| 4540910 | Spark plug for internal-combustion engine | Ryoji Kondo, Kozo Takamura | 1985-09-10 |
| 4488081 | Ignition plug | Ryoji Kondo, Kozo Takamura, Yasuyuki Sato, Minoru Nagai | 1984-12-11 |
| 4267483 | Insulator on spark plug electrode coated with zirconium and vanadium oxides | Koichi Nakajima, Tomoji Ishiguro, Tokuhiko Okamoto, Minoru Konaka, Minoru Nagai +1 more | 1981-05-12 |
| 4250426 | Spark plug having vanadium oxide islands on central insulator | Koichi Nakajima, Tomoji Ishiguro, Tokuhiko Okamoto, Minoru Konaka, Minoru Nagai +1 more | 1981-02-10 |