Issued Patents 1989
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887877 | Optical devices and optical integrated circuits | Hiroaki Inoue, Hitoshi Nakamura, Toshio Katsuyama, Hiroyoshi Matsumura | 1989-12-19 |
| 4885753 | Semiconductor laser device of variable wavelength type | Makoto Okai, Kazuhisa Uomi, Shinji Tsuji, Naoki Chinone | 1989-12-05 |
| 4873691 | Wavelength-tunable semiconductor laser | Kazuhisa Uomi, Shinji Tsuji, Makoto Okai, Naoki Chinone | 1989-10-10 |
| 4840446 | Photo semiconductor device having a multi-quantum well structure | Hitoshi Nakamura, Hiroaki Inoue, Toshio Katsuyama, Hiroyoshi Matsumura | 1989-06-20 |
| 4813757 | Optical switch including bypass waveguide | Hiroaki Inoue, Hiroyoshi Matsumura, Hitoshi Nakamura, Toshio Katsuyama, Naoki Chinone | 1989-03-21 |
| 4803692 | Semiconductor laser devices | Hiroyoshi Matsumura | 1989-02-07 |