Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5681633 | Magneto optical disc, apparatus for reproducing the same and method of reproducing the same | Nobuyasu Negishi, Takamasa Yoshikawa | 1997-10-28 |
| 5617406 | Optical disc with heat blocking bands between tracks | Fumihiko Yokogawa | 1997-04-01 |
| 5592445 | Exchange coupling optical recording medium and recording/reproducing device therefor | — | 1997-01-07 |