Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5978354 | Optical transmission system and transmission line switching control method | Hisashi Taketomi, Fumihiro Ikawa, Kanji Naito, Junichi Moriyama | 1999-11-02 |
| 5771225 | System for adjusting characteristic of protection unit when switching from plural working units having various characteristics to protection unit | — | 1998-06-23 |
| 5343464 | Switching system between working transmission lines and protection transmission line | Takeo Fukushima | 1994-08-30 |
| 5335223 | Pointer processing circuit in sonet system | — | 1994-08-02 |
| 5327275 | Switching system of optical transmission lines for protecting from trouble | Kazuo Yamane, Naonobu Fujimoto, Takashi Kihara, Takeo Fukushima, Koichi Nishimura | 1994-07-05 |
| 5282193 | Maintenance signal transmission system | Takeo Fukushima, Koichi Nishimura | 1994-01-25 |