Top Inventors at Duplo Seiko All Time
| Rank | Name | Patents |
|---|---|---|
| 1 | Hideki Oiwa | 12 |
| 2 | Ryuichi Oota | 9 |
| 3 | Yoshihide Sugiyama | 8 |
| #4 | Masasuke Funase | 7 |
| #5 | Kazuya Yamamoto | 6 |
| #6 | Takaaki Maeda | 5 |
| #7 | Akihiko Toki | 5 |
| #8 | Katsunori Takahashi | 4 |
| #9 | Akira Kawaguchi | 4 |
| #10 | Kenta Yamada | 3 |
| #11 | Masayasu Matsumoto | 3 |
| #12 | Nobuki Tanimoto | 3 |
| #13 | Tomoyuki Nagayama | 3 |
| #14 | Akane Tokutake | 3 |
| #15 | Akira Wada | 3 |
| #16 | Chikara Miyamoto | 2 |
| #17 | Haruka Takemoto | 2 |
| #18 | Kazuhito Oguri | 2 |
| #19 | Kazuya Takitani | 2 |
| #20 | Satoshi Ota | 2 |
| #21 | Tadahira Ohkochi | 2 |
| #22 | Taichi Yamaguchi | 2 |
| #23 | Tetsuo Onishi | 2 |
| #24 | Yasunari Okagaito | 2 |
| #25 | Yasuhiro Tanaka | 2 |
| #26 | Chiharu Taniguchi | 1 |
| #27 | Hiroki IKESHITA | 1 |
| #28 | Hidemasa Kanada | 1 |
| #29 | Hiromichi KANAOKA | 1 |
| #30 | Junichi Kakuta | 1 |
| #31 | Kazuma UEKI | 1 |
| #32 | Ken Matsushita | 1 |
| #33 | Kei Sakata | 1 |
| #34 | Masato Okuno | 1 |
| #35 | Satomi Uegaito | 1 |
| #36 | Shuhei Kosaka | 1 |
| #37 | Taichi Sato | 1 |
| #38 | Takuya Tashiro | 1 |
| #39 | Yoshihisa Higashimoto | 1 |
| #40 | Yoshiteru Ishikawa | 1 |