Issued Patents 2002
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6493312 | Optical information medium | Ryou Negishi, Toshiaki Tajima, Emiko Hamada | 2002-12-10 |
| 6480450 | Method and apparatus for recording optical information by varying recording pulse width | Ryou Negishi, Masahiko Hirano | 2002-11-12 |
| 6452899 | Optical information medium and recording method therefor | Toshiaki Tajima, Yuji Tomizawa, Ryou Negishi, Emiko Hamada | 2002-09-17 |
| 6445676 | Optical information medium | Yuji Tomizawa, Emiko Hamada | 2002-09-03 |