Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7505603 | Dynamic micro speaker with dual suspension | — | 2009-03-17 |
| 6389148 | Electric-acoustic transducer having moving magnet and transducing method thereof | Dong Ok Yoo | 2002-05-14 |