Showing 1–6 of 6 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Masahiro Kouno | Mitsui Toatsu Chemicals, Incorporated | 21 |
| 2 | Yoshiichi Yamatani | — | 3 |
| 3 | Masahiro Kono | Mitsui Toatsu Chemicals, Incorporated | 2 |
| #4 | Tomoaki Okawa | Hitachi | 1 |
| #4 | Yoshichi Yamatani | — | 1 |
| #4 | Kazuhiro Kikkawa | Nippon Valqua Kogyo Kabushiki Kaisha | 1 |