Showing 1–12 of 12 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Hiroshi Kawato | Idemitsu Kosan Co. | 4 |
| 2 | Koji Hanya | Nippon Steel | 3 |
| 3 | Hidetoshi Hatanaka | Nippon Steel | 2 |
| 3 | Hajime Onozawa | Nippon Steel | 2 |
| #5 | Sadamu Shirokuma | Mitsui Chemicals | 1 |
| #5 | Tetuharu Ibaraki | Nippon Steel | 1 |
| #5 | Yasuo Hamamoto | Sumitomo Electric Industries | 1 |
| #5 | Ken Kimura | NS Sumikin Stainless | 1 |
| #5 | Junji Nakashima | Nippon Steel | 1 |
| #5 | Makoto Kawashima | Nissan Chemical Industries | 1 |
| #5 | Kiwamu Tokuhisa | Nippon Steel Chemical Co. | 1 |
| #5 | Naoto Takeda | Teac | 1 |