Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6477135 | Optical information recording medium and method for recording and reproduction information thereon | Noboru Yamada | 2002-11-05 |
| 6449239 | Optical information recording medium with thermal diffusion layer | Noboru Yamada, Ken'ichi Nagata, Hideo Kusada | 2002-09-10 |