Issued Patents All Time
Showing 26–32 of 32 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5644565 | Optical recording medium including a plurality of diffracted grating cells | Susumu Takahashi, Fujio Iwata | 1997-07-01 |
| 5625619 | Optical recording medium having a plurality of different diffraction grating cells | Susumu Takahashi, Fujio Iwata | 1997-04-29 |
| 5617248 | Diffraction grating array and display having a diffraction grating | Susumu Takahashi | 1997-04-01 |
| 5570338 | Optical information recording medium which uses diffraction grating | Susumu Takahashi, Fujio Iwata | 1996-10-29 |
| 5301062 | Display having diffraction grating pattern | Susumu Takahashi, Fujio Iwata | 1994-04-05 |
| 5291027 | Optical identification multiple diffraction grating mark member and card using the same | Takehide Kita, Akihiko Kobayashi, Susumu Takahashi | 1994-03-01 |
| 5132812 | Method of manufacturing display having diffraction grating patterns | Susumu Takahashi, Fujio Iwata | 1992-07-21 |