Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5644565 | Optical recording medium including a plurality of diffracted grating cells | Toshiki Toda, Susumu Takahashi | 1997-07-01 |
| 5625619 | Optical recording medium having a plurality of different diffraction grating cells | Toshiki Toda, Susumu Takahashi | 1997-04-29 |