Issued Patents 2002
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6487151 | Optical information recording and reproducing system with overwrite capability and recording medium for use therewith | Ken'ichi Nagata, Kenichi Nishiuchi, Nobuo Akahira, Kenji Narumi | 2002-11-26 |
| 6447869 | Optical information recording medium and method for producing the same | Hidemi Isomura, Akihiro Moteki | 2002-09-10 |
| 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, Naoyasu Miyagawa, Nobuo Akahira | 2002-06-25 |