Issued Patents 2004
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6815032 | Optical disc | Akira Nishizawa, Takeo Kojima | 2004-11-09 |
| 6744725 | Information recording medium | — | 2004-06-01 |
| 6721253 | DISKLIKE RECORDING MEDIA, A METHOD FOR DETECTING FORGED DISKS, AN ANTI-FORGERY SYSTEM FOR PERFORMING A TRUE-FALSE JUDGEMENT BASED ON INFORMATION COLLECTED FROM THE RECORDING MEDIA, AND A MANUFACTURING APPARATUS FOR RECORDING INFORMATION IN THE DISKS | — | 2004-04-13 |
| 6693873 | Information recording medium having parallel grooves with alternating convex-concave sections | Akira Nishizawa | 2004-02-17 |
| 6683985 | Method of discriminating shape of free-form curved surface | Kiwamu Kase, Akitake Makinouchi, Naomichi Mori | 2004-01-27 |
| 6676791 | Multilayered optical information-recording media and process for manufacture thereof | Akira Nishizawa | 2004-01-13 |