Issued Patents 1989
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887877 | Optical devices and optical integrated circuits | Shinji Sakano, Hitoshi Nakamura, Toshio Katsuyama, Hiroyoshi Matsumura | 1989-12-19 |
| 4861130 | Optical modulating device utilizing polariton substance | Toshio Katsuyama, Hiroyoshi Matsumura, Tadashi Fukuzawa, Naoki Chinone | 1989-08-29 |
| 4840446 | Photo semiconductor device having a multi-quantum well structure | Hitoshi Nakamura, Shinji Sakano, Toshio Katsuyama, Hiroyoshi Matsumura | 1989-06-20 |
| 4832430 | Optical switch | Kunio Tada, Yoshitaka Okada, Hiroyoshi Matsumura | 1989-05-23 |
| 4813757 | Optical switch including bypass waveguide | Shinji Sakano, Hiroyoshi Matsumura, Hitoshi Nakamura, Toshio Katsuyama, Naoki Chinone | 1989-03-21 |