Top Inventors at Duplo All Time
| Rank | Name | Patents |
|---|---|---|
| 1 | Shuhei Yamamoto | 4 |
| 2 | Hideo Tanaka | 1 |
| 3 | Kazuki Imai | 1 |
| #4 | Kazuhiro Tanaka | 1 |
| #5 | Masatoshi Takahashi | 1 |
| #6 | Masato Takeda | 1 |
| #7 | Shinichi Iwakiri | 1 |
| #8 | Tomio Honma | 1 |
| #9 | Toshio Miki | 1 |
| #10 | Tomohiko Niwa | 1 |
| #11 | Yoshiyuki Ishikura | 1 |
| #12 | Yutaka Iijima | 1 |
| #13 | Yuichi Misawa | 1 |
| #14 | Yutaka Oki | 1 |