Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7426164 | Disk kind identifying method and disk apparatus | Mitutaka Yamaguti | 2008-09-16 |
| 6438097 | Optical recording disc capable of preventing illegal copy | Seiji Kajiyama, Youichi Tsuchiya, Kenji Torazawa | 2002-08-20 |
| 6262967 | Optical recording disc capable of preventing illegal copy | Seiji Kajiyama, Youichi Tsuchiya, Kenji Torazawa | 2001-07-17 |
| 6108296 | Optical recording disc capable of preventing illegal copy | Seiji Kajiyama, Youichi Tsuchiya, Kenji Torazawa | 2000-08-22 |