Issued Patents 1989
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874216 | Variable-waveguide optical branching filter | Katsuyuki Utaka, Kazuo Sakai, Yuichi Matsushima | 1989-10-17 |
| 4837526 | Semiconductor external optical modulator | Masatoshi Suzuki, Yukio Noda, Yukitoshi Kushiro | 1989-06-06 |
| 4826291 | Method for manufacturing diffraction grating | Katsuyuki Utaka, Yuichi Matsushima | 1989-05-02 |
| 4820655 | Method for manufacturing semiconductor optical integrated device with optical waveguide regions | Yukio Noda, Masatoshi Suzuki, Yukitoshi Kushiro | 1989-04-11 |
| 4815090 | Distributed feedback semiconductor laser with monitor | Masashi Usami, Katsuyuki Utaka, Yuichi Matsushima | 1989-03-21 |
| 4811353 | Semiconductor optical modulator | Yukio Noda, Masatoshi Suzuki, Yukitoshi Kushiro | 1989-03-07 |
| 4811352 | Semiconductor integrated light emitting device | Masatoshi Suzuki, Hideaki Tanaka, Yukitoshi Kushiro | 1989-03-07 |
| 4796274 | Semiconductor device with distributed bragg reflector | Masashi Usami, Yukio Noda, Masatoshi Suzuki | 1989-01-03 |