Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4843032 | Process for producing a DFB laser with a diffraction grating superlattice | Yasunori Tokuda | 1989-06-27 |
| 4817110 | Semiconductor laser device | Yasunori Tokuda, Noriaki Tsukada, Keisuke Kojima, Yoshinori Nomura, Teruhito Matsui | 1989-03-28 |