Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10118208 | Hollow spring utilizing seamless steel pipe | Kotaro Toyotake, Tomoyuki Minami, Noritoshi Takamura | 2018-11-06 |
| 9482302 | Process for manufacturing seamless steel pipe, hollow spring utilizing seamless steel pipe | Kotaro Toyotake, Tomoyuki Minami, Noritoshi Takamura | 2016-11-01 |