Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12302987 | Shoe insole | Keiichi Sakai, Naoji Sakai | 2025-05-20 |
| 11298589 | Foot training device and foot training method | Keiichi Sakai, Naoji Sakai | 2022-04-12 |
| 10188540 | Sacroiliac belt | Yasushi Miki, Naoji Sakai, Keiichi Sakai | 2019-01-29 |