Top Inventors at Union Tool All Time
| Rank | Name | Patents |
|---|---|---|
| 1 | Ichiro Katayama | 4 |
| 2 | Shoichi Takahashi | 4 |
| 3 | Hidehito Watanabe | 3 |
| #4 | Hideki Osaki | 2 |
| #5 | Hideo Wakui | 2 |
| #6 | Ryo SHINOZAKI | 2 |
| #7 | Shuntaro Suzuki | 2 |
| #8 | Yoshiharu Shinbo | 2 |
| #9 | Hironobu Saito | 1 |
| #10 | Kazutaka Sato | 1 |
| #11 | Mariko Matsui | 1 |
| #12 | Makoto Matsunaga | 1 |
| #13 | Madoka Nitta | 1 |
| #14 | Masanori Kakuda | 1 |
| #15 | Munehiro Nakamura | 1 |
| #16 | Naoki Jinbo | 1 |
| #17 | Nozomu Sato | 1 |
| #18 | Paul Quillen | 1 |
| #19 | Sonoko Ishimaru | 1 |
| #20 | Taishi Matsui | 1 |
| #21 | Tetsutaro Ohori | 1 |
| #22 | Yoshinobu Watanabe | 1 |
| #23 | Yuichi Nakajima | 1 |
| #24 | Yuji Watanabe | 1 |
| #25 | Akira Sato | 1 |