Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6606291 | Optical disk and optical disk drive | Katsutaro Ichihara, Akiko Hirao, Hideyuki Nishizawa | 2003-08-12 |
| 6554972 | Information recording medium and its manufacturing method | Katsutaro Ichihara, Sumio Ashida, Keiichiro Yusu, Naomasa Nakamura | 2003-04-29 |