Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6233078 | Photo signal amplification transmission system | Naoki Maruyama | 2001-05-15 |
| 6151148 | Optical amplifier relay transmission system | — | 2000-11-21 |
| 5943146 | Optical transmission system in which no arrival of a first light signal is notified from a first station to a second station by an alarm light signal multiplexed with a second light signal in wavelength | — | 1999-08-24 |