Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7502486 | Plane speaker having coil plate guide device | Joung-Youl Shin | 2009-03-10 |
| 7480392 | Plate type speaker using horizontal vibration voice coil | Joung-Youl Shin | 2009-01-20 |