Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7609728 | Optical transmission switching device | Toshiaki Arikawa, Ryuuichi Ikematsu, Shigekazu Harada, Hajima Ishikawa, Takahide Sugita | 2009-10-27 |
| 7372804 | Multiplex communication system and method | Toshiaki Arikawa, Ryuuichi Ikematsu, Shigekazu Harada, Hajime Ishikawa, Takahide Sugita | 2008-05-13 |
| 7209493 | Multiplex transmission system and multiplex transmitter | — | 2007-04-24 |