Issued Patents 2004
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6803597 | Semiconductor light-emitting device using graded multi quantum barrier | Chikara Watatani | 2004-10-12 |
| 6774389 | Optical semiconductor device | — | 2004-08-10 |
| 6768760 | Ridge-waveguide semiconductor laser device | Yutaka Mihashi, Tohru Takiguchi | 2004-07-27 |
| 6674784 | Distributed feedback laser device and method for manufacturing the same | Tohru Takiguchi | 2004-01-06 |