Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6749531 | Multi-speed gear system for a chain transmission device of a bicycle | — | 2004-06-15 |
| 6186017 | Multi-speed bicycle transmission | Joong S. Chang | 2001-02-13 |
| 6089114 | Bicycle transmission with selectable automatic down shifting | — | 2000-07-18 |