Showing 1–7 of 7 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Mika Okada | Sumitomo Metal Mining Co. | 4 |
| 2 | Hirofumi TSUNEMATSU | Sumitomo Metal Mining Co. | 3 |
| 2 | Takeshi Chonan | Sumitomo Metal Mining Co. | 3 |
| #4 | Hideaki Fukuyama | Sumitomo Metal Mining Co. | 1 |
| #4 | Kotaro Tomeoka | Ohkuchi Materials Co. | 1 |
| #4 | Keiichi Otaki | Ohkuchi Materials Co. | 1 |
| #4 | Kaoru Hishiki | Ohkuchi Materials Co. | 1 |