Issued Patents 2003
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6606291 | Optical disk and optical disk drive | Katsutaro Ichihara, Akiko Hirao, Toshihiko Nagase | 2003-08-12 |
| 6577591 | Optical recording medium | Akiko Hirao, Kazuki Matsumoto, Takayuki Tsukamoto | 2003-06-10 |
| 6545971 | Information recording/reproducing system for recording/reproducing information in three-dimensional recording medium of a light passing-through type | Takayuki Tsukamoto, Akiko Hirao | 2003-04-08 |