Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6821707 | Optical information recording medium, producing method thereof and method of recording/erasing/reproducing information | Mayumi Uno, Noboru Yamada, Hiroyuki Ohta, Eiji Ohno, Ken'ichi Nagata | 2004-11-23 |
| 6807142 | Optical information recording medium and method for initializing the same | Ken'ichi Nagata, Kenichi Nishiuchi, Noboru Yamada | 2004-10-19 |