Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7938238 | Rotary damper | Kazuyoshi Koizumi, Shunsuke Okabayashi, Ken Hayashi | 2011-05-10 |
| D566122 | Rotary damper | — | 2008-04-08 |
| D566123 | Rotary damper | — | 2008-04-08 |
| D539296 | Rotary damper | Ken Hayashi, Shun-Hung Cho, Kazuyoshi Koizumi | 2007-03-27 |