Issued Patents All Time
Showing 1–21 of 21 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9160529 | Secret communication system and method for generating shared secret information | Akio Tajima, Akihiro Tanaka, Seigo Takahashi | 2015-10-13 |
| 8949300 | Circuit and method for controlling quality of random numbers | Akihiro Tanaka, Akio Tajima, Seigo Takahashi | 2015-02-03 |
| 8718485 | Quantum key distribution system, optical transmitter, optical modulation control circuit, and optical modulation control method | Akihiro Tanaka, Akio Tajima, Seigo Takahashi | 2014-05-06 |
| 8638942 | Method and system for managing shared random numbers in secret communication network | Akio Tajima, Seigo Takahashi, Akihiro Tanaka | 2014-01-28 |
| 8391491 | Communication system and synchronization control method | Akihiro Tanaka, Akio Tajima, Seigo Takahashi | 2013-03-05 |
| 8204231 | Method and device for managing cryptographic keys in secret communications network | Akio Tajima, Akihiro Tanaka, Seigo Takahashi | 2012-06-19 |
| 8184989 | Communication system and timing control method | Akio Tajima, Akihiro Tanaka, Seigo Takahashi | 2012-05-22 |
| 8171354 | Communication system and method for controlling the same | Akihiro Tanaka, Akio Tajima, Seigo Takahashi | 2012-05-01 |
| 8041232 | Optical transmitter and control method thereof | Akihiro Tanaka, Akio Tajima, Seigo Takahashi | 2011-10-18 |
| 8041039 | Secret communications system and channel control method | Akio Tajima, Akihiro Tanaka, Seigo Takahashi | 2011-10-18 |
| 8009984 | Method and apparatus for measuring optical power of very weak light, and optical communication system using the same | Akio Tajima, Akihiro Tanaka, Seigo Takahashi | 2011-08-30 |
| 7974540 | Communication system and communication method using the same | Akihisa Tomita, Kazuo Nakamura, Akio Tajima, Akihiro Tanaka, Yoshihiro Nanbu +3 more | 2011-07-05 |
| 7934132 | Communication system and method for controlling the same | Akihiro Tanaka, Akio Tajima, Seigo Takahashi | 2011-04-26 |
| 7907850 | Optical communication device and quantum key distribution system using the same | Akihiro Tanaka, Akio Tajima, Seigo Takahashi | 2011-03-15 |
| 7783042 | Communication system and synchronization method thereof | Shuji Suzuki, Akio Tajima, Seigo Takahashi, Akihiro Tanaka | 2010-08-24 |
| 7734757 | Method and system for managing shared information | Akio Tajima, Seigo Takahashi, Akihiro Tanaka | 2010-06-08 |
| 7734180 | Single fibre bidirectional optical transmission system and single fibre bidirectional optical amplifier | Akio Tajima | 2010-06-08 |
| 7616765 | Method and system for generating shared information | Akio Tajima, Akihiro Tanaka | 2009-11-10 |
| 7613396 | Multiplexing communication system and crosstalk elimination method | Akio Tajima, Akihiro Tanaka | 2009-11-03 |
| 7580634 | Transmission method, transmitter-receiver, and transmitting-receiving system | Takeshi Takeuchi, Akio Tajima, Shigekazu Harada, Akihiro Tanaka | 2009-08-25 |
| 7560683 | Photo detecting circuit and noise elimination method utilized to produce a photo reception signal | Seigo Takahashi, Akio Tajima, Takeshi Takeuchi, Akihiro Tanaka | 2009-07-14 |