Top Inventors at Osaka Cement Co. All Time
| Rank | Name | Patents |
|---|---|---|
| 1 | Shiro Ikegami | 4 |
| 2 | Toru Saito | 4 |
| 3 | Akitoshi Imura | 4 |
| #4 | Jun Takada | 2 |
| #5 | Kiichi Oda | 2 |
| #6 | Mikio Takano | 2 |
| #7 | Naoichi Yamamoto | 2 |
| #8 | Tomomitsu Sugi | 2 |
| #9 | Toshio Takada | 2 |
| #10 | Yoshinari Miura | 2 |
| #11 | Itsuji Yoshikawa | 1 |
| #12 | Kouji Kataoka | 1 |
| #13 | Minoru Makita | 1 |
| #14 | Sowjun Matsumura | 1 |
| #15 | Tadashi Chiba | 1 |
| #16 | Yoshiko Hotta | 1 |
| #17 | Yutaka Ando | 1 |
| #18 | Akira Chudo | 1 |
| #19 | Akira Ito | 1 |