Top Inventors at Kawatetsu Mining Co. All Time
| Rank | Name | Patents |
|---|---|---|
| 1 | Hidefumi Konnai | 7 |
| 2 | Yoshio Aso | 5 |
| 3 | Kan Saito | 4 |
| #4 | Yoshihito Tachi | 4 |
| #5 | Hideshi Katayama | 3 |
| #6 | Shuetsu Ogasawara | 3 |
| #7 | Yasutaka Fukuda | 3 |
| #8 | Yuuki Narita | 3 |
| #9 | Kensuke Matsuki | 2 |
| #10 | Morishige Uchida | 2 |
| #11 | Nobuyuki Sato | 2 |
| #12 | Shunroh Nagata | 2 |
| #13 | Shigeru Yatabe | 2 |
| #14 | Takao Hamada | 2 |
| #15 | Tetsuo Inoue | 2 |
| #16 | Tetsuhiko Mizoguchi | 2 |
| #17 | Yoshiaki Hamano | 2 |
| #18 | Yoshio Suzuki | 2 |
| #19 | Akira Seki | 2 |
| #20 | Fumio SUDO | 1 |
| #21 | Hideomi Koinuma | 1 |
| #22 | Kazuo Fueki | 1 |
| #23 | Kunihiko Ishizaka | 1 |
| #24 | Masashi Kawasaki | 1 |
| #25 | Mitsuyoshi Matsushita | 1 |
| #26 | Osamu Ebato | 1 |
| #27 | Shunro Nagata | 1 |
| #28 | Takero Ito | 1 |
| #29 | Tadasu Kirihara | 1 |
| #30 | Tadao Shimizu | 1 |
| #31 | Toshihiko Funahashi | 1 |
| #32 | Toshio Ogawa | 1 |
| #33 | Seki Akira | 1 |