Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10995811 | Coil spring | Toshinori Watanabe, Noritoshi Takamura, Fumio Yamamoto, Fumio Takahashi | 2021-05-04 |
| 8950739 | Spring | Norihiro Tajima, Jun Tominaga | 2015-02-10 |
| 8523153 | Spring | Norihiro Tajima | 2013-09-03 |