Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7020395 | Optical transmission apparatus monitoring optical performance | Dai Hagimura, Junichi Ishiwatari | 2006-03-28 |
| 6657953 | Signal loopback device | Masanori Hiramoto, Hidetaka Kawahara, Keiichiro Tsukamoto | 2003-12-02 |
| 6192437 | Transmission apparatus with control circuit/relay within each card providing connection to related card output depending on related slot ID/ redundancy/non-redundancy, working/protection signals | Keiichiro Tsukamoto | 2001-02-20 |
| 6188701 | Apparatus and method for interfacing between communication networks | Keiichiro Tsukamoto | 2001-02-13 |
| 5790520 | Path protection switch ring system for line saving even though line setting operation was not carried out | Koji Iwamoto | 1998-08-04 |
| 5757774 | Network traffic protection system | — | 1998-05-26 |
| 5754545 | Add-drop multiplexer with enhancement of accessibility to signals in different hierarchical levels and flexibility in various services and circuit setting operations | Masahiro Shinbashi, Kazuo Takatsu, Hideaki Mochizuki, Junichi Ishiwatari, Koji Iwamoto | 1998-05-19 |
| 5719747 | Interface unit for communication device with parts positioned on a printed-wiring board for achieving desirable operating characteristics | Kazuaki Kashiwada, Kenji Joukou | 1998-02-17 |
| 5640140 | Alarm processing apparatus | Kanta Yamamoto | 1997-06-17 |
| 5557437 | Optical terminal system having self-monitoring function | Toshiharu Sakai, Yoshinori Nakamura, Takashi Umegaki, Nobuo Iguchi, Miki Hagino +4 more | 1996-09-17 |
| 5177758 | Semiconductor laser device with plural active layers and changing optical properties | Shinji Sakano, Naoki Chinone, Tsukuru Ohtoshi, Kazuhisa Uomi, Tomonobu Tsuchiya +1 more | 1993-01-05 |
| 5173909 | Wavelength tunable laser diode | Shinji Sakano, Katutoshi Saito, Naoki Chinone | 1992-12-22 |
| 5119393 | Semiconductor laser device capable of controlling wavelength shift | Shinji Sakano, Naoki Chinone, Tsukuru Ohtoshi, Kazuhisa Uomi, Tomonobu Tsuchiya +1 more | 1992-06-02 |