Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6691228 | Signal reproducing/recording/transmitting method and apparatus and signal recording medium | Yoichiro Sako | 2004-02-10 |
| 6687828 | Method and apparatus for ciphering playback mode information for recording on record medium | Yoichiro Sako, Yoshitomo Osawa, Akira Kurihara, Isao Kawashima | 2004-02-03 |