Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12135068 | Hollow spring and method of manufacturing the same | Toru Hirokane | 2024-11-05 |
| 10987779 | Hollow spring and manufacturing method thereof | — | 2021-04-27 |
| 10300756 | Suspension coil spring | — | 2019-05-28 |
| 9770957 | Suspension coil spring and strut type suspension | Masanori Sano, Toru Hirokane | 2017-09-26 |
| 9091105 | Opening/closing device | — | 2015-07-28 |
| 9094490 | Cover mechanism for opening and closing device | — | 2015-07-28 |
| 8713758 | Opening/closing device | Yasuhiro Mitsui | 2014-05-06 |