Showing 1–6 of 6 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Nobuhiro Kasa | Hitachi | 2 |
| 2 | Akikazu Toyoda | Mitsubishi Materials | 1 |
| 2 | Eiichiro Hirose | Mitsubishi Materials | 1 |
| 2 | Yoshiomi Go | Mitsubishi Materials | 1 |
| 2 | Atsushi Iwasa | Mitsubishi Pencil Company, Limited | 1 |
| 2 | Yoichi Koroku | Furukawa Co. | 1 |