Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6728198 | Optical information medium and recording method therefor | Toru Fujii, Yuji Tomizawa, Ryou Negishi, Emiko Hamada | 2004-04-27 |
| 6721265 | High-density optical information recording medium and a substrate and a stamper for the manufacture thereof | Toru Fujii, Yuji Tomizawa, Ryou Negishi, Emiko Hamada | 2004-04-13 |
| 6711118 | Optical information recording medium for recording optically reproducible signals thereon through the use of a recording laser beam and method for recording optical information thereon | Toru Fujii, Yuji Tomizawa, Ryou Negishi, Emiko Hamada | 2004-03-23 |
| 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 |
| 6291045 | Optical information recording medium | Toru Fujii, Yuji Tomizawa, Emiko Hamada | 2001-09-18 |
| 5895697 | Optical information medium | Yuji Tomizawa, Ryou Negishi, Emiko Hamada, Toru Fujii | 1999-04-20 |