Issued Patents 2004
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6829211 | Optical recording medium having first and second recording areas of different formats | Yoichiro Sako, Katsumi Toyama | 2004-12-07 |
| 6804188 | Data recording medium, data recording apparatus and method, and data reproducing apparatus and method | Yukio Shishido, Tetsuji Kawahima, Yoichiro Sako, Katsumi Toyama, Shigeki Tsukatani | 2004-10-12 |
| 6738752 | Information distributing apparatus and information distributing method, information receiving apparatus and information receiving met | Yoichiro Sako, Shuichi Ito, Masayuki Obata, Kazuko Sakurai | 2004-05-18 |
| 6731578 | Optical disk recording and/or reproducing device, and focusing servomechanism | Yoichiro Sako, Hiroshi Ogawa | 2004-05-04 |
| 6728174 | Recording medium and reproducing method and apparatus for recording medium | Yoichiro Sako, Hiroshi Ogawa | 2004-04-27 |
| 6707784 | Optical storage medium having two recording areas of different formats | Yoichiro Sako, Katsumi Toyama | 2004-03-16 |
| 6700845 | Multi-layer optical recording medium and method and apparatus for reproducing optical data | Yoichiro Sako, Takao Ihashi, Hiroshi Ogawa, Masanobu Yamamoto | 2004-03-02 |
| 6680889 | Data recording medium and data recording apparatus | Shuichi Ito, Yoichiro Sako, Masayuki Obata, Kazuko Sakurai | 2004-01-20 |