Issued Patents All Time
Showing 1–16 of 16 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7489620 | Optical information recording and reproducing medium | Toshiaki Iwanaga, Takeharu Shibatoko, Hideki Tanabe, Masashi Kubota, Masaki Nakano +1 more | 2009-02-10 |
| 7102990 | Optical information-recording medium and optical information recording/reproducing method | — | 2006-09-05 |
| 6807143 | Information-recording medium and information reproducing apparatus | — | 2004-10-19 |
| 6606293 | Optical information recording medium and methods for recording, reading, and erasing information thereupon | Shuichi Ohkubo, Masaki Itoh | 2003-08-12 |
| 6122243 | Optical information recording apparatus, optical recording medium, and method or judging tracking polarity of optical recording medium | — | 2000-09-19 |
| 6117511 | Optical recording media | Masaki Itoh, Syu-Ichi Ohkubo | 2000-09-12 |
| 6115336 | Apparatus for optically recording data into a disc | — | 2000-09-05 |
| 5906908 | System and method for simultaneously verifying optical data writing and optical data writing medium for use therein | Shuichi Ohkubo, Masaki Itou | 1999-05-25 |
| 5878022 | High density optical information recording medium using high refractive index layer | Masatsugu Ogawa | 1999-03-02 |
| 5862122 | Phase change optical disk and a method for recording and playbacking optical information on or from an optical disk | Shuichi Ohkubo | 1999-01-19 |
| 5798993 | System and method for simultaneously verifying optical data writing and optical data writing medium for use therein | Shuichi Ohkubo, Masaki Itou | 1998-08-25 |
| 5708653 | Single-substrate multi-layer optical disk for read-only storage and phase change rewritable storage | Syuichi Ohkubo | 1998-01-13 |
| 5631895 | Optical information recording medium | Tatsunori Ide, Shuichi Ohkubo | 1997-05-20 |
| 5521901 | Re-writable phase change type optical disk with suppressed recording mark distortion | Shuichi Ohkubo, Tatsunori Ide | 1996-05-28 |
| 5381395 | Information detection of a phase-change type optical recording medium by shifting the phase of a reference light | — | 1995-01-10 |
| 4862437 | Magneto-optical recording reproducing, and erasing apparatus having two independent magnetic field applying devices | — | 1989-08-29 |