Issued Patents 2004
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6791933 | Optical pickup using an optical phase plate | Jang-hoon Yoo, Chul-woo Lee, Chong-sam Chung, Kun-ho Cho, Hyun-seob Choi +3 more | 2004-09-14 |
| 6765857 | Optical recording and pickup head for digital versatile disc compatible with read-writable compact disc by adopting flat plate lens having staircase type diffraction grating structure | Jang-hoon Yoo, Chul-woo Lee, Kun-ho Cho | 2004-07-20 |
| 6728177 | Method of recording data on optical disc at high multiple speed and apparatus thereof | Kyu Hwan Jung | 2004-04-27 |
| 6686697 | Circuit to protect a light element | Myoung-cheol Cho, Byung-ryul Ryoo, Kyung-ui Park, Ui-yol Kim | 2004-02-03 |