Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6819640 | Disc-shaped record medium, method for manufacturing the same, and apparatus for manufacturing the same | — | 2004-11-16 |
| 6714509 | Disk recording medium and disk drive apparatus | Eiji Kumagai, Yukio Shishido | 2004-03-30 |