Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12195135 | Crank variable-speed gear device for increasing rotational power | Jang Young Han | 2025-01-14 |
| 8475327 | Accelerating system for improving the running speed of a bicycle | — | 2013-07-02 |