Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11719298 | Coil spring | Seiji Okamura | 2023-08-08 |
| 11499600 | Coil spring | Seiji Okamura | 2022-11-15 |
| 11181160 | Coil spring | Seiji Okamura | 2021-11-23 |
| 11131356 | Coil spring | Seiji Okamura | 2021-09-28 |
| 9782819 | Spiral spring manufacturing method | Naoya Wada, Keiichiro Teratoko | 2017-10-10 |
| 9400026 | Spiral spring | Naoya Wada, Keiichiro Teratoko, Akio Kidooka, Yuu Yokoyama, Akira Hori | 2016-07-26 |
| 7556011 | Valve structure for internal combustion | Keiichiro Teratoko, Tadashi Saito, Takao Suzuki, Futoshi Fujiwara | 2009-07-07 |