Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7280470 | Ring network for sharing protection resource by working communication paths | Tatsuya Shiragaki, Naoya Henmi, Makoto Nishio, Hitoshi Takeshita | 2007-10-09 |
| 7197246 | Optical switch, optical amplifier and optical power controller as well as optical add-drop multiplexer | Seigo Takahashi, Naoya Henmi | 2007-03-27 |
| 6895183 | Optical add-drop multiplexer | Naoya Henmi, Hitoshi Takeshita | 2005-05-17 |
| 6809846 | Optical switch and optical network | Naoya Henmi | 2004-10-26 |
| 6657952 | Ring network for sharing protection resource by working communication paths | Tatsuya Shiragaki, Naoya Henmi, Makoto Nishio, Hitoshi Takeshita | 2003-12-02 |
| 6538779 | Optical signal monitoring method and apparatus | Hitoshi Takeshita, Tatsuya Shiragaki, Naoya Henmi | 2003-03-25 |
| 6466344 | Optical switch, optical amplifier and optical power controller as well as optical add-drop multiplexer | Seigo Takahashi, Naoya Henmi | 2002-10-15 |
| 6424440 | Optical switch, optical amplifier and optical power controller as well as optical add-drop multiplexer | Seigo Takahashi, Naoya Henmi | 2002-07-23 |
| 6404525 | Optical add-drop multiplexer | Naoya Henmi, Hitoshi Takeshita | 2002-06-11 |
| 6400498 | Optical signal repeating and amplifying device and optical level adjusting device | Naoya Henmi | 2002-06-04 |
| 6347168 | Optical switch and optical switch system | Naoya Henmi | 2002-02-12 |