Top Inventors at Riken Keiki Co. All Time
| Rank | Name | Patents |
|---|---|---|
| 1 | Shuji Tajima | 7 |
| 2 | Junichi Koyano | 4 |
| 3 | Masahide Kitamura | 4 |
| #4 | Kenichi Kojima | 3 |
| #5 | Tomoo Ishiguro | 3 |
| #6 | Yasunori Takei | 3 |
| #7 | Yoshikazu Shibasaki | 3 |
| #8 | Haruhiko Kondo | 2 |
| #9 | Juniti Koyano | 2 |
| #10 | Mamoru Furusato | 2 |
| #11 | Nobuo Nakano | 2 |
| #12 | Seiichi Otani | 2 |
| #13 | Yukio Nakamura | 2 |
| #14 | Hirotaka Obata | 1 |
| #15 | Kei Ono | 1 |
| #16 | Kouzi Suzuki | 1 |
| #17 | Masayuki Uda | 1 |
| #18 | Naoyuki Miyagawa | 1 |
| #19 | Nobuhisa Kawai | 1 |
| #20 | Ryuji Asada | 1 |
| #21 | Shinsuke Kogure | 1 |
| #22 | Shunsuke Takahashi | 1 |
| #23 | Shoichi Uchikoshi | 1 |
| #24 | Shinji UESUGI | 1 |
| #25 | Shoei Yasuda | 1 |
| #26 | Shinichi Yonemura | 1 |
| #27 | Takuo Aida | 1 |
| #28 | Tetsuya Kawabe | 1 |
| #29 | Tsuyoshi Ohta | 1 |
| #30 | Yasuhiro Terauchi | 1 |
| #31 | Yoshiharu Ao | 1 |
| #32 | Yuki Tanaka | 1 |
| #33 | Koji Uritani | 1 |
| #34 | Yoshinori Shirahashi | 1 |
| #35 | Akihiro Yamamoto | 1 |