Issued Patents 2003
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6667566 | Piezoelectric transformer for fluorescent lamp | Choong Sik Yoo | 2003-12-23 |
| 6639636 | Liquid crystal display of direct lighting type | Ho-Han Yoo, Young-Ryul Han | 2003-10-28 |
| 6626201 | Apparatus for preventing reverse flow in drainage | — | 2003-09-30 |
| 6603272 | Rosen type piezoelectric transformer with multiple output electrodes, and stabilizer for multiple light source using that | Jang-Hyoun Youm | 2003-08-05 |
| 6600273 | High-power electronic ballast for fluorescent lamp | Choong Sik Yoo, Jong-Man Jung | 2003-07-29 |
| 6586863 | Rosen type piezoelectric transformer with multiple output electrodes | Jang-Hyoun Youm | 2003-07-01 |
| 6566820 | Piezoelectric transformer with multiple outputs | Jang-Hyoun Youm | 2003-05-20 |
| 6544433 | Piezoelectric ceramic composition, and high power output transformer made of the same composition | Choong Sik Yoo, Joo Hyun Yoo, Yong-Woo Lee | 2003-04-08 |
| 6533957 | Piezoelectric ceramic composition, and high power output transformer made of the same composition | Choong Sik Yoo, Joo Hyun Yoo, Yong-Woo Lee | 2003-03-18 |
| 6509699 | Digital controlled electronic ballast with piezoelectric transformer | Jong Soo Kim, Sang Hyun Lee, Choong Sik Yoo, Jong-Man Jung | 2003-01-21 |