Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5699238 | Zero voltage switching controller of resonance mode converter and electronic ballast using the same | Young-Sik Lee, Hyun-min Jo, Nak-Choon Choi | 1997-12-16 |
| 5648702 | Dimming control circuit having feedback frequency control | Nak-Choon Choi | 1997-07-15 |