Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4888817 | Polarization diversity light receiving system using baseband combining | Shiro Ryu | 1989-12-19 |
| 4805977 | Optical coupler for optical direct amplifier | Yasuaki Tamura | 1989-02-21 |