Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4835782 | Method and apparatus for an oscillation frequency separation among a plurality of laser devices | Naoki Shimosaka | 1989-05-30 |
| 4807227 | Optical wavelength-division switching system with coherent optical detection system | Masahiko Fujiwara, Minoru Shikada | 1989-02-21 |