Issued Patents 2004
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6829201 | Magnetic information recording medium having regions magnetized in different directions, a method for recording and reproducing for the same, and a method of manufacturing the same | Masakazu Nishikawa, Kazuyuki Usuki, Makoto Nagao | 2004-12-07 |
| 6821459 | Information-recording medium and method for producing the same | — | 2004-11-23 |
| 6808782 | Optical information recording medium | Toshio Ishida | 2004-10-26 |
| 6731592 | Optical information recording medium and method of manufacturing optical information recording medium | — | 2004-05-04 |