Top Inventors at Otsuka Koki Co. All Time
| Rank | Name | Patents |
|---|---|---|
| 1 | Satoru Masuda | 9 |
| 2 | Naoto Shibui | 4 |
| 3 | Yukiyoshi Akutsu | 3 |
| #4 | Fumikage Yamanaka | 2 |
| #5 | Hideto Nebuya | 2 |
| #6 | Masateru Momozu | 2 |
| #7 | Takahiko Midori | 2 |
| #8 | Tomoya Sugiyama | 2 |
| #9 | Hiroyuki Ishigami | 1 |
| #10 | Hitoshi Tomura | 1 |
| #11 | Hiroshi Tsukamoto | 1 |
| #12 | Kazuhito Ishiyama | 1 |
| #13 | Kazumi Sukeshita | 1 |
| #14 | Kiyoshi Sadakata | 1 |
| #15 | Masao Komatsuzaki | 1 |
| #16 | Seiichi Tanaka | 1 |
| #17 | Takaya Azumi | 1 |
| #18 | Takeshi Ejiri | 1 |
| #19 | Tadahiro Shoji | 1 |
| #20 | Teruaki Kasai | 1 |
| #21 | Tetsuya Matsumoto | 1 |
| #22 | Yoshihisa Iwanaga | 1 |
| #23 | Yoshihide Sasamoto | 1 |
| #24 | Shuji Hitani | 1 |