Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6636659 | Optical amplification apparatus and optical transmission system | Koji Yamanaka | 2003-10-21 |
| 6538803 | Optical amplifier and optical wavelength division multiplexing communication system | — | 2003-03-25 |