Issued Patents All Time
Showing 51–75 of 103 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8041232 | Optical transmitter and control method thereof | Akihiro Tanaka, Seigo Takahashi, Wakako Maeda | 2011-10-18 |
| 8041039 | Secret communications system and channel control method | Akihiro Tanaka, Wakako Maeda, Seigo Takahashi | 2011-10-18 |
| 8009984 | Method and apparatus for measuring optical power of very weak light, and optical communication system using the same | Wakako Maeda, Akihiro Tanaka, Seigo Takahashi | 2011-08-30 |
| 7974540 | Communication system and communication method using the same | Akihisa Tomita, Kazuo Nakamura, Akihiro Tanaka, Yoshihiro Nanbu, Shuuji Suzuki +3 more | 2011-07-05 |
| 7934132 | Communication system and method for controlling the same | Akihiro Tanaka, Seigo Takahashi, Wakako Maeda | 2011-04-26 |
| 7907850 | Optical communication device and quantum key distribution system using the same | Akihiro Tanaka, Seigo Takahashi, Wakako Maeda | 2011-03-15 |
| 7899183 | Random number generating and sharing system, encrypted communication apparatus, and random number generating and sharing method for use therein | Shuji Suzuki | 2011-03-01 |
| 7869599 | Quantum cryptography key distributing system and synchronizing method used in the same | — | 2011-01-11 |
| 7783042 | Communication system and synchronization method thereof | Wakako Maeda, Shuji Suzuki, Seigo Takahashi, Akihiro Tanaka | 2010-08-24 |
| 7734180 | Single fibre bidirectional optical transmission system and single fibre bidirectional optical amplifier | Wakako Maeda | 2010-06-08 |
| 7734757 | Method and system for managing shared information | Wakako Maeda, Seigo Takahashi, Akihiro Tanaka | 2010-06-08 |
| 7616765 | Method and system for generating shared information | Wakako Maeda, Akihiro Tanaka | 2009-11-10 |
| 7613396 | Multiplexing communication system and crosstalk elimination method | Wakako Maeda, Akihiro Tanaka | 2009-11-03 |
| 7613391 | Optical signal switching device for use in an optical protection network | — | 2009-11-03 |
| 7580634 | Transmission method, transmitter-receiver, and transmitting-receiving system | Takeshi Takeuchi, Shigekazu Harada, Akihiro Tanaka, Wakako Maeda | 2009-08-25 |
| 7560683 | Photo detecting circuit and noise elimination method utilized to produce a photo reception signal | Seigo Takahashi, Takeshi Takeuchi, Akihiro Tanaka, Wakako Maeda | 2009-07-14 |
| 7295779 | Wavelength division-multiplexing optical transmission system | Shigekazu Harada | 2007-11-13 |
| 6957018 | Optical packet exchange system and optical switch | Soichiro Araki, Yoshihiko Suemura, Seigo Takahashi, Yoshiharu Maeno, Naoya Henmi | 2005-10-18 |
| 6760346 | Packet switching network | Yoshihiko Suemura, Soichiro Araki, Yoshiharu Maeno, Seigo Takahashi | 2004-07-06 |
| 6760552 | Optical receiving circuit and optical communication device | Hiroaki Takahashi, Soichiro Araki, Naoya Henmi, Yoshihiko Suemura, Yoshiharu Maeno +1 more | 2004-07-06 |
| 6714740 | Optical network and switch control method for use in the optical network | — | 2004-03-30 |
| 6570687 | Optical packet exchange system and optical switch | Soichiro Araki, Yoshihiko Suemura, Seigo Takahashi, Yoshiharu Maeno, Naoya Henmi | 2003-05-27 |
| 6538161 | Fluorescent substances | Tadao Nakaya, Takao Yamauchi, Hidemasa Mouri | 2003-03-25 |
| 6528657 | Fluorescent carbazole derivative | Tadao Nakaya, Takao Yamauchi, Hidemasa Mouri | 2003-03-04 |
| 6441935 | Optical packet exchange system and optical switch | Soichiro Araki, Yoshihiko Suemura, Seigo Takahashi, Yoshiharu Maeno, Naoya Henmi | 2002-08-27 |