Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8076966 | Analog switch circuit for wide frequency band | Minoru Hosoda | 2011-12-13 |
| 6310708 | Supervisory signal transmitter and method | Kenji Ota | 2001-10-30 |
| 6266466 | Optical amplifier and optical transmission system | Yoshio Nabeyama, Kazuyuki Tanikawa | 2001-07-24 |
| 5859938 | Optical amplifier and optical transmission system | Yoshio Nabeyama, Kazuyuki Tanikawa | 1999-01-12 |
| 5737105 | Optical repeater | Kenji Ohta | 1998-04-07 |
| 5293260 | Optical repeater off-state supervisory method and device therefor | Katsumi Kikawa | 1994-03-08 |
| 5130837 | Optical repeater haivng means for preventing malfunction due to the presence of noise | Katsumi Kikawa | 1992-07-14 |
| 5097353 | Optical repeater having phase inversion circuit | Haruo Fujiwara | 1992-03-17 |
| 5088106 | Phase shift circuit and repeater using the same | Kazunori Hayami | 1992-02-11 |
| 4871121 | Method and tank for storing a submarine optical cable | Kazuyuki Kodaka, Mitsuhiro Motegi | 1989-10-03 |