Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6765851 | Optical disc, data-recording apparatus and data-recording method | Tetsuji Kawashima, Futoshi Tsukada, Shinji Ohta, Masazumi Shiozawa | 2004-07-20 |
| 6693855 | Optical disc and optical disc apparatus | Tetsuji Kawashima, Yukio Shishido, Futoshi Tsukada | 2004-02-17 |