Issued Patents 2004
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6826325 | Optical signal switching unit | Seiichiro Tabata | 2004-11-30 |
| 6804469 | Supervisory system of optical amplifier repeater system and supervisory method of optical amplifier repeater system | Yasunori Kasahara, Hideki Goto, Kenkichi Shimomura, Yukio Horiuchi, Masatoshi Suzuki +2 more | 2004-10-12 |
| 6801720 | Optical signal quality supervisory device | Yojiro Osaki, Aritomo Uemura, Hiroshi Ichibangase, Kiwami Matsushita, Tadayoshi Kitayama +4 more | 2004-10-05 |