Issued Patents All Time
Showing 1–16 of 16 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8886013 | Device and method for preventing unauthorized reproduction of content | Yasuhiro Miyao | 2014-11-11 |
| 7515545 | Signal repeater and switching device, method of detecting connecting relation between signal repeater and switching device and communication system | — | 2009-04-07 |
| 7280470 | Ring network for sharing protection resource by working communication paths | Naoya Henmi, Makoto Nishio, Hitoshi Takeshita, Hirofumi Shimomura | 2007-10-09 |
| 7043662 | Communication device that performs automatic failure recovery and automatic failure recovery method | — | 2006-05-09 |
| 6785473 | WDM network and WDM network device | Shinobu Sasaki, Shinya Nakamura, Takashi Yamazaki | 2004-08-31 |
| 6657952 | Ring network for sharing protection resource by working communication paths | Naoya Henmi, Makoto Nishio, Hitoshi Takeshita, Hirofumi Shimomura | 2003-12-02 |
| 6538779 | Optical signal monitoring method and apparatus | Hitoshi Takeshita, Hirofumi Shimomura, Naoya Henmi | 2003-03-25 |
| 6211983 | Optical communication network unit comprising an optical signal converting apparatus and/or an optical signal receiving apparatus | — | 2001-04-03 |
| 6128115 | Optical switch device | — | 2000-10-03 |
| 6125104 | Network node for switching quality detector to incoming signal specified by request message from adjacent node | Naoya Henmi | 2000-09-26 |
| 6115517 | Optical communication network apparatus and optical switching network | Naoya Henmi | 2000-09-05 |
| 6023452 | Network failure restoration method with different recovery performances for different signal groups | — | 2000-02-08 |
| 5757526 | Optical communication network and method for optically detecting a fault | Naoya Henmi | 1998-05-26 |
| 5663820 | Optical network using multiplexed payload and OAM signals | — | 1997-09-02 |
| 5471332 | Hitless switching apparatus and method for optical network | Takahiro Shiozawa, Syuji Suzuki, Masahiko Fujiwara | 1995-11-28 |
| 5457556 | Optical cross-connect system with space and wavelength division switching stages for minimizing fault recovery procedures | — | 1995-10-10 |