Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6493312 | Optical information medium | Ryou Negishi, Toru Fujii, Emiko Hamada | 2002-12-10 |
| 6452899 | Optical information medium and recording method therefor | Toru Fujii, Yuji Tomizawa, Ryou Negishi, Emiko Hamada | 2002-09-17 |