Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6259255 | Surge locating system of power transmission line and method thereof | Masaaki Ozawa, Toshiaki Kojima | 2001-07-10 |
| 5956650 | Communication system interconnecting telephone line and single-frequency simultaneous transmission/reception radio system | Osamu Suzuki, Mitsuo Shiraishi | 1999-09-21 |
| 5734969 | Radio communication method and apparatus which adds an interrupt enable synchronizing signal to a compressed voice signal in place of a synchronizing A signal | Mitsuo Shiraishi | 1998-03-31 |
| 5697049 | Radio relay method, radio relay system using the method and radio unit | Mitsuo Shiraishi, Fujio Sumi | 1997-12-09 |
| 5633862 | DTMF signal transmission method in single frequency simultaneous transmitting and receiving system and single frequency simultaneous transmitting and receiving system transceiver capable of transmitting DTMF signal | Kenichi Suzuki, Fujio Sumi, Osamu Suzuki | 1997-05-27 |
| 5553079 | Radio communication apparatus and method for multiplex transmission of voice and data signals | Atsuyoshi Niki, Tsyneyuki Minowa, Ichiro Maeda | 1996-09-03 |
| 5524274 | Transceiver controlled by absence/presence of input signal | Norio Takahashi, Nobuo Sekiguchi, Fujio Sumi | 1996-06-04 |
| 5508619 | System for discriminating kinds of surges on power transmission lines | Masaaki Ozawa | 1996-04-16 |
| 5493698 | Radio apparatus for simulataneously transmitting and receiving signals using a simple frequency | Osamu Suzuki, Kazuo Suzuka, Mitsuo Shiraishi, Fujio Sumi, Kenichi Suzuki | 1996-02-20 |
| 5490167 | Duplex voice communication radio transmitter-receiver | Fujio Sumi, Susumu Nakabayashi, Kouichi Ishikawa | 1996-02-06 |
| 5355363 | Voice transmission method and apparatus in duplex radio system | Katsumi Takahashi, Takashi Kurokawa, Nobuo Sekiguchi, Kazuo Suzuka, Kiyoyuki Isawa +2 more | 1994-10-11 |
| 5070537 | System for detecting defective point on power transmission line by utilizing satellite | Masatoshi Yamaki, Akira Terashima, Masaaki Ozawa | 1991-12-03 |