Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7046611 | Optical pickup compatible with a digital versatile disk and a recordable compact disk using a holographic ring lens | Jang-hoon Yoo | 2006-05-16 |
| 6304540 | Optical pickup compatible with a digital versatile disk and a recordable compact disk using a holographic ring lens | Jang-hoon Yoo | 2001-10-16 |