Issued Patents 2002
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6449237 | 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, Pyong-yong Seong | 2002-09-10 |
| 6430139 | Objective lens for high-density optical focusing, and optical pickup using the same | Jang-hoon Yoo, Seung-tae Jung, Chul-woo Lee, Chong-sam Chung, Dong-Ho Shin | 2002-08-06 |
| 6400666 | Optical pickup device | Jang-hoon Yoo, Yong-hoon Lee, Seok-jung Kim, Seung-tae Jung, Chul-woo Lee +1 more | 2002-06-04 |
| 6396638 | Optical pickup device capable of stable tracking | Jang-hoon Yoo, Seung-tae Jung, Chul-woo Lee, Joong-eon Seo, Dong-Ho Shin | 2002-05-28 |
| 6359850 | Optical pickup having catadioptric objective lens | Chong-sam Chung, Chul-woo Lee, Yong-hoon Lee | 2002-03-19 |
| 6337841 | Compatible optical pickup | Kun-soo Kim, Jong-ryull Kim, Myoung Soo Choi, Hyung-taek Oh, Jong-hwa Yu +3 more | 2002-01-08 |