Issued Patents 2003
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6657952 | Ring network for sharing protection resource by working communication paths | Tatsuya Shiragaki, Makoto Nishio, Hitoshi Takeshita, Hirofumi Shimomura | 2003-12-02 |
| 6643042 | Optical communication network node | Makoto Nishio | 2003-11-04 |
| 6570687 | Optical packet exchange system and optical switch | Soichiro Araki, Yoshihiko Suemura, Akio Tajima, Seigo Takahashi, Yoshiharu Maeno | 2003-05-27 |
| 6538779 | Optical signal monitoring method and apparatus | Hitoshi Takeshita, Hirofumi Shimomura, Tatsuya Shiragaki | 2003-03-25 |