Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11041547 | Shifting manipulation-assisting device and hub-embedded transmission having the same | Hyuk Yoo, Tae Jin Jung, Seong-Cheol An | 2021-06-22 |
| D916627 | Electric scooter | Sung-Cheol An, Hyuk Yoo, Tae Jin Jung | 2021-04-20 |
| 10851873 | Transmission for motor | Hyuk Yoo, Tae Jin Jung, Sung-Cheol An | 2020-12-01 |
| 7503868 | Automatic speed changing device | — | 2009-03-17 |
| 7351180 | Automatic speed changing device | — | 2008-04-01 |
| 6478711 | Apparatus for changing speed of bicycles | — | 2002-11-12 |
| 6390487 | Driving direction changing apparatus of bicycle hub | — | 2002-05-21 |
| 6383108 | Apparatus for changing direction of driving force for bicycles | — | 2002-05-07 |
| 6383107 | Apparatus for changing direction of driving force for bicycles | — | 2002-05-07 |
| 6142904 | Apparatus for changing direction of driving force for bicycles | — | 2000-11-07 |
| 6045475 | Controller for a changeable pedaling system in a bi-directional pedaling bicycle | — | 2000-04-04 |
| 5971884 | Power changing apparatus of bicycle hub | — | 1999-10-26 |
| 5957802 | Apparatus for changing rotation of pedal shaft for bicycle | — | 1999-09-28 |
| 5954614 | Apparatus for changing power direction for bicycle | — | 1999-09-21 |