Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6804188 | Data recording medium, data recording apparatus and method, and data reproducing apparatus and method | Yukio Shishido, Yoichiro Sako, Tatsuya Inokuchi, Katsumi Toyama, Shigeki Tsukatani | 2004-10-12 |
| 6657938 | Disk having expanded elapsed time information | Yoichiro Sako, Yukio Shishido, Shigeki Tsukatani, Katsumi Toyama, Tatsuya Inokuchi | 2003-12-02 |