Issued Patents 2002
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6487147 | Optical information recording medium and an optical information recording/reproduction device | Yasuhiro Gotoh, Tetsuya Akiyama | 2002-11-26 |
| 6480449 | Optical information recording medium, optical information recording apparatus, and method of recording test signal on the same | Kenji Narumi | 2002-11-12 |
| 6411592 | OPTICAL INFORMATION RECORDING MEDIUM HAVING CONVEX AND CONCAVE PORTIONS FOR RECORDING INFORMATION AND AN ADDITIONAL PORTION FOR CONDITION DATA, AND RECORDING AND REPRODUCING APPARATUS FOR USING THE MEDIUM | Kenichi Nishiuchi, Eiji Ohno, Nobuo Akahira | 2002-06-25 |