Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6813237 | Optical recording medium having a plurality of meandering groove tracks, optical recording medium producing apparatus and optical recording medium producing method | Atsushi Yamaguchi, Masahiro Kato, Eiji Muramatsu, Seiro Oshima | 2004-11-02 |
| 6687214 | Recording medium and apparatus and method for manufacturing the same | Masahiro Kato, Eiji Muramatsu, Atsushi Yamaguchi, Shoji Taniguchi, Seiro Oshima +3 more | 2004-02-03 |