Top Inventors at Nippon Piston Ring Co. 2021
| Rank | Name | Patents |
|---|---|---|
| 1 | Atsushi Chiba | 1 |
| 2 | Hiroshi Matsushima | 1 |
| 3 | Hirokazu Murata | 1 |
| #4 | Iwao Hiraishi | 1 |
| #5 | Jyuta Tase | 1 |
| #6 | Kazuhiro Fujimura | 1 |
| #7 | Kazuhiko Kanno | 1 |
| #8 | Kazumi Moroi | 1 |
| #9 | Mitsuru Urabe | 1 |
| #10 | Naoyuki Akimoto | 1 |
| #11 | Takashi Kawabata | 1 |
| #12 | Takasumi KUBO | 1 |
| #13 | Yoshiki Ishikawa | 1 |
| #14 | Yuki KIMURA | 1 |