Top Inventors at Ricoh Watch Co. All Time
| Rank | Name | Patents |
|---|---|---|
| 1 | Kenji Kamiya | 3 |
| 2 | Shigekazu Takahashi | 2 |
| 3 | Eisuke Yoshii | 1 |
| #4 | Hiroshi Inoue | 1 |
| #5 | Hiroshi Kawase | 1 |
| #6 | Hiroshi Yasuda | 1 |
| #7 | Junichi Yoshida | 1 |
| #8 | Masatoshi Hosoi | 1 |
| #9 | Nobuo Kaneko | 1 |
| #10 | Nobuo Tohyama | 1 |
| #11 | Nobuo Toyama | 1 |
| #12 | Ritsu Katsuoka | 1 |
| #13 | Shinji Sawada | 1 |
| #14 | Shozo Yamano | 1 |
| #15 | Takeshi Takemoto | 1 |