Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |