Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7058305 | Optical submarine communication system and surge suppressing apparatus of the optical submarine communication system | Katsuhiko Horinouchi, Hirotaka Muto, Masaki Nakaoka | 2006-06-06 |
| 6934434 | Circuit for switching optical paths | Eiichi Nakagawa | 2005-08-23 |
| 6792192 | Optical variable attenuator | Eiichi Nakagawa | 2004-09-14 |
| 6714394 | Electric power feeding line switching method, electric power feeding line switching apparatus and electric power feeding line switching system | Eiichi Nakagawa | 2004-03-30 |
| 6563236 | Feed line switching circuit and branching unit | Eiichi Nakagawa, Kenichi Asakawa, Kazunori Sato | 2003-05-13 |