Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7335459 | Phase-change optical recording medium | Sumio Ashida, Takayuki Tsukamoto, Keiichiro Yusu, Katsutaro Ichihara, Naomasa Nakamura +1 more | 2008-02-26 |
| 7011876 | Optical recording medium | Sumio Ashida, Keiichiro Yusu, Katsutaro Ichihara, Naomasa Nakamura | 2006-03-14 |
| 6805935 | Optical recording medium | Sumio Ashida, Keiichiro Yusu, Katsutaro Ichihara, Naomasa Nakamura | 2004-10-19 |