Showing 1–8 of 8 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Shinya Kagei | Mitsui Mining & Smelting Co. | 11 |
| 2 | Tetsuya Mitsumoto | Mitsui Mining & Smelting Co. | 6 |
| 3 | Yoshimi Hata | Mitsui Mining & Smelting Co. | 5 |
| #4 | Toshikazu Matsuyama | Komatsu | 4 |
| #5 | Hitohiko Ide | Mitsui Mining & Smelting Co. | 2 |
| #5 | Yasuhiro Ochi | Mitsui Mining & Smelting Co. | 2 |
| #5 | Kentaro Ochi | Mitsui Mining & Smelting Co. | 2 |
| #8 | Takayoshi HOSHINO | Aohata | 1 |