Issued Patents All Time
Showing 51–67 of 67 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7214416 | Phase-change optical recording medium | Tsukasa Nakai, Sumio Ashida, Keiichiro Yusu, Takayuki Tsukamoto, Noritake Oomachi +2 more | 2007-05-08 |
| 7132147 | Phase-change optical recording medium | Tsukasa Nakai, Sumio Ashida, Keiichiro Yusu, Takayuki Tsukamoto, Noritake Oomachi +1 more | 2006-11-07 |
| 7110348 | Optical information recording medium | Keiichiro Yusu, Sumio Ashida, Katsutaro Ichihara | 2006-09-19 |
| 7011876 | Optical recording medium | Sumio Ashida, Keiichiro Yusu, Katsutaro Ichihara, Noritake Ohmachi | 2006-03-14 |
| 6944116 | Optical information recording medium | Keiichiro Yusu, Sumio Ashida, Katsutaro Ichihara | 2005-09-13 |
| 6842419 | Optical information recording medium and optical disk drive | Sumio Ashida, Keiichiro Yusu, Katsutaro Ichihara, Noritake Oomachi | 2005-01-11 |
| 6805935 | Optical recording medium | Sumio Ashida, Keiichiro Yusu, Katsutaro Ichihara, Noritake Ohmachi | 2004-10-19 |
| 6800224 | Production process of optical disc and optical disc produced thereby | Yasuaki Ootera | 2004-10-05 |
| 6554972 | Information recording medium and its manufacturing method | Katsutaro Ichihara, Sumio Ashida, Keiichiro Yusu, Toshihiko Nagase | 2003-04-29 |
| 6296915 | Optical recording medium | Keiichiro Yusu, Sumio Ashida, Akira Kikitsu, Toshihiko Nagase, Katsutaro Ichihara +2 more | 2001-10-02 |
| 6165579 | Optical information recording medium and recording/reproduction method | — | 2000-12-26 |
| 5776574 | Optical recording medium and optical recording/reproducing apparatus | Yoshinori Honguh, Toyoki Taguchi, Hiroshi Hasegawa, Tadashi Kobayashi, Naoki Morishita | 1998-07-07 |
| 5474826 | Optical recording medium and optical recording/reproducing apparatus | Yoshinori Honguh, Toyoki Taguchi, Hiroshi Hasegawa, Tadashi Kobayashi, Naoki Morishita | 1995-12-12 |
| 5431975 | Optical recording medium and optical recording/reproducing apparatus | Yoshinori Honguh, Toyoki Taguchi, Hiroshi Hasegawa, Tadashi Kobayashi, Naoki Morishita | 1995-07-11 |
| 5431978 | Information recording medium and recording method using the same | Naoki Morishita | 1995-07-11 |
| 5396480 | Method and apparatus for recording information using an energy beam of power levels changed stepwise | Naoki Morishita, Katsumi Suzuki, Tadashi Kobayashi | 1995-03-07 |
| 4803660 | Optical recording medium | Tadashi Kobayashi, Katsumi Suzuki | 1989-02-07 |