Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5228043 | Direct modulation phase shift keying (DM-PSK) transmission system | Takao Naito, Terumi Chikama, Shigeki Watanabe | 1993-07-13 |
| 5115332 | Receiver for coherent optical communication | Takao Naito, Terumi Chikama, Shigeki Watanabe, Tetsuya Kiyonaga, Yoshihito Onoda | 1992-05-19 |
| 5003626 | Dual balanced optical signal receiver | Terumi Chikama, Tetsuya Kiyonaga, Chiaki Ohsawa | 1991-03-26 |
| 4965858 | Polarization diversity optical receiver for coherent optical communication | Takao Naito, Terumi Chikama, Shigeki Watanabe, Tetsuya Kiyonaga, Yoshihito Onoda +2 more | 1990-10-23 |
| 4694224 | Lighting apparatus for an electric discharge lamp | Hisato Nakagawa, Atsuo Koyama, Mitsuo Akatsuka | 1987-09-15 |
| 4650289 | Optical circulator | — | 1987-03-17 |