Issued Patents 2011
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8041039 | Secret communications system and channel control method | Akio Tajima, Akihiro Tanaka, Seigo Takahashi | 2011-10-18 |
| 8041232 | Optical transmitter and control method thereof | Akihiro Tanaka, Akio Tajima, 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 |