Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10358008 | Suspension coil spring | Kenji Yamamotoya, Ken Takahashi, Toshiaki Sato, Mitsuhiro Sugiyama, Yoshio Kobayashi +6 more | 2019-07-23 |
| 10266027 | Suspension coil spring | Jun Umeno, Ken Okura, Shuji Ohmura | 2019-04-23 |
| 9713946 | Strut-type suspension and compression coil spring for suspension | Kenji Yamamotoya, Ken Takahashi, Toshiaki Sato, Mitsuhiro Sugiyama, Yoshio Kobayashi +6 more | 2017-07-25 |
| 9463676 | Suspension and compression coil spring for suspension | Kenji Yamamotoya, Ken Takahashi, Toshiaki Sato, Mitsuhiro Sugiyama, Yoshio Kobayashi +6 more | 2016-10-11 |