Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6496807 | Recording medium, recording method and recording apparatus incorporating anti-tamper features involving writing billing information into a write-once area | Yoichiro Sako, Masayuki Obata, Shuichi Ito, Kazuko Sakurai | 2002-12-17 |
| 6438084 | Data recording apparatus and method, data playback apparatus and method, and optical disc | Tetsuji Kawashima, Yukio Shishido, Yoichiro Sako | 2002-08-20 |