Issued Patents All Time
Showing 1–25 of 30 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7292785 | Optical transmission system constructing method and system | Keiji Tomooka, Naohiro Sakakida, Shin Nishimura, Yoshihiro Ashi, Hironari Matsuda +6 more | 2007-11-06 |
| 7167652 | Optical transmission system constructing method and system | Keiji Tomooka, Naohiro Sakakida, Shin Nishimura, Yoshihiro Ashi, Hironari Matsuda +6 more | 2007-01-23 |
| 7127170 | Optical frequency division multiplexing network | Atsushi Takai, Akihiko Takase | 2006-10-24 |
| 7099596 | Optical transmitter | Koichi Watanabe, Masataka Shirai | 2006-08-29 |
| 6931039 | Optical transmitter equipment and semiconductor laser device | Kouji Nakahara | 2005-08-16 |
| 6850713 | Optical single sideband transmitter | Nobuhiko Kikuchi, Toshiki Sugawara | 2005-02-01 |
| 6728489 | Optical transmission system constructing method and system | Keiji Tomooka, Naohiro Sakakida, Shin Nishimura, Yoshihiro Ashi, Hironari Matsuda +6 more | 2004-04-27 |
| 6658217 | Optical receiver | Kenichi Ohhata, Toru Masuda, Katsuyoshi Washio, Yasushi Hatta | 2003-12-02 |
| 6619865 | Optical frequency division multiplexing network | Atsushi Takai, Akihiko Takase | 2003-09-16 |
| 6587260 | Band-expanding method for optical amplifiers and optical transmission apparatus | Nobuhiko Kikuchi | 2003-07-01 |
| 6304357 | Optical receiver | Kenichi Ohhata, Toru Masuda, Katsuyoshi Washio, Yasushi Hatta | 2001-10-16 |
| 6266169 | Optical transmission equipment which transmits an amplified optical data signal and an optical surveillance signal | Keiji Tomooka, Naohiro Sakakida, Shin Nishimura, Yoshihiro Ashi, Hironari Matsuda +6 more | 2001-07-24 |
| 6018405 | Optical transmission equipment which transmits an amplified optical data signal and an optical surveillance signal | Keiji Tomooka, Naohiro Sakakida, Shin Nishimura, Yoshihiro Ashi, Hironari Matsuda +6 more | 2000-01-25 |
| 6005699 | Optical wavelength multiplexing system | Keiji Tomooka, Naohiro Sakakida, Shin Nishimura, Yoshihiro Ashi, Hironari Matsuda +6 more | 1999-12-21 |
| 5875046 | Optical repeater and optical transmitter | Keiji Tomooka, Naohiro Sakakida, Shin Nishimura, Yoshihiro Ashi, Hironari Matsuda +6 more | 1999-02-23 |
| 5861972 | Optical multiplex transmission equipment and method | Keiji Tomooka, Naohiro Sakakida, Shin Nishimura, Yoshihiro Ashi, Hironari Matsuda +6 more | 1999-01-19 |
| 5844445 | Feedback type pre-amplifier | — | 1998-12-01 |
| 5838475 | Optical regenerator and an optical transmission system | Takashi Funada, Yukihiko Wakai, Kazuo Hagimoto | 1998-11-17 |
| 5812289 | Optical repeater and optical transmitter | Keiji Tomooka, Naohiro Sakakida, Shin Nishimura, Yoshihiro Ashi, Hironari Matsuda +6 more | 1998-09-22 |
| 5801864 | Optical frequency division multiplexing network | Atsushi Takai, Akihiko Takase | 1998-09-01 |
| 5739932 | Optical transmission system constructing method and system | Keiji Tomooka, Naohiro Sakakida, Shin Nishimura, Yoshihiro Ashi, Hironari Matsuda +6 more | 1998-04-14 |
| 5612959 | Multicast communications method | Akihiko Takase, Shiro Tanabe, Noboru Endo, Yusuke Mishina, Toshiya Oouchi +1 more | 1997-03-18 |
| 5576876 | Optical regenerator and an optical transmission system | Takashi Funada, Yukihiko Wakai, Kazuo Hagimoto | 1996-11-19 |
| 5555477 | Optical transmission system constructing method and system | Keiji Tomooka, Naohiro Sakakida, Shin Nishimura, Yoshihiro Ashi, Hironari Matsuda +6 more | 1996-09-10 |
| 5510921 | Optical frequency division multiplexing network | Atsushi Takai, Akihiko Takase | 1996-04-23 |