Issued Patents All Time
Showing 1–25 of 47 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7280470 | Ring network for sharing protection resource by working communication paths | Tatsuya Shiragaki, Makoto Nishio, Hitoshi Takeshita, Hirofumi Shimomura | 2007-10-09 |
| 7197246 | Optical switch, optical amplifier and optical power controller as well as optical add-drop multiplexer | Hirofumi Shimomura, Seigo Takahashi | 2007-03-27 |
| 7126950 | Method and system for transmission and reception of asynchronously multiplexed signals | Kazuo Takagi, Shinobu Sasaki, Kurenai Murakami, Motoo Nishihara, Yoshinori Rokugou | 2006-10-24 |
| 6957018 | Optical packet exchange system and optical switch | Soichiro Araki, Yoshihiko Suemura, Akio Tajima, Seigo Takahashi, Yoshiharu Maeno | 2005-10-18 |
| 6895183 | Optical add-drop multiplexer | Hirofumi Shimomura, Hitoshi Takeshita | 2005-05-17 |
| 6809846 | Optical switch and optical network | Hirofumi Shimomura | 2004-10-26 |
| 6771907 | Optical ring system | Yuuki Yoshifuji, Shuichi Iida, Takashi Yamazaki, Youko Nakabayashi, Shinya Nakamura +9 more | 2004-08-03 |
| 6760552 | Optical receiving circuit and optical communication device | Akio Tajima, Hiroaki Takahashi, Soichiro Araki, Yoshihiko Suemura, Yoshiharu Maeno +1 more | 2004-07-06 |
| 6657952 | Ring network for sharing protection resource by working communication paths | Tatsuya Shiragaki, Makoto Nishio, Hitoshi Takeshita, Hirofumi Shimomura | 2003-12-02 |
| 6643042 | Optical communication network node | Makoto Nishio | 2003-11-04 |
| 6570687 | Optical packet exchange system and optical switch | Soichiro Araki, Yoshihiko Suemura, Akio Tajima, Seigo Takahashi, Yoshiharu Maeno | 2003-05-27 |
| 6538779 | Optical signal monitoring method and apparatus | Hitoshi Takeshita, Hirofumi Shimomura, Tatsuya Shiragaki | 2003-03-25 |
| 6466344 | Optical switch, optical amplifier and optical power controller as well as optical add-drop multiplexer | Hirofumi Shimomura, Seigo Takahashi | 2002-10-15 |
| 6445473 | Optical switching apparatus using wavelength division multiplexing technology | Yoshihiko Suemura | 2002-09-03 |
| 6441935 | Optical packet exchange system and optical switch | Soichiro Araki, Yoshihiko Suemura, Akio Tajima, Seigo Takahashi, Yoshiharu Maeno | 2002-08-27 |
| 6429955 | Optical network | Yoshihiko Suemura, Soichiro Araki, Akio Tajima, Seigo Takahashi, Yoshiharu Maeno | 2002-08-06 |
| 6424440 | Optical switch, optical amplifier and optical power controller as well as optical add-drop multiplexer | Hirofumi Shimomura, Seigo Takahashi | 2002-07-23 |
| 6407834 | Optical wave network system and method of monitoring a network trouble | Hitoshi Takeshita | 2002-06-18 |
| 6404525 | Optical add-drop multiplexer | Hirofumi Shimomura, Hitoshi Takeshita | 2002-06-11 |
| 6400498 | Optical signal repeating and amplifying device and optical level adjusting device | Hirofumi Shimomura | 2002-06-04 |
| 6373911 | Bit synchronization circuit | Akio Tajima, Yoshihiko Suemura, Soichiro Araki, Seigo Takahashi, Yoshiharu Maeno | 2002-04-16 |
| RE37621 | Optical communication transmission system | Shogo Nakaya, Tomoki Saito | 2002-04-02 |
| 6347168 | Optical switch and optical switch system | Hirofumi Shimomura | 2002-02-12 |
| 6333800 | Optical communication system using wavelength-division multiplexed light | Yoshihiko Suemura | 2001-12-25 |
| 6271949 | Optical communication system using wavelength-division multiplexed light | Yoshihiko Suemura | 2001-08-07 |