Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6819650 | Optical disc having land pre-pits and variable groove depths | Takayuki Deno, Toyohito Asanuma, Tsutomu Matsumoto, Fumitaka Tsuji | 2004-11-16 |
| 6733957 | Disk substrate and manufacturing method therefor, and disk manufactured by the disk substrate | Toyohito Asanuma | 2004-05-11 |