Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6351469 | Sound/data sharing communications system | Keiichi Otani, Masaharu Matsumoto, Koji Yano, Takaya Yamamoto | 2002-02-26 |
| 6347092 | Time division multiple access communication system, signal receiving method in time division multiple access communication system, and center unit for use in time division multiple access communication system | Takayuki Ogawa, Takaya Yamamoto | 2002-02-12 |
| 6028845 | Communication-line-quality measuring system using a conventional signal frame structure | Yasuhiro Saito, Yuji Maeda, Satoshi Kasuya | 2000-02-22 |
| 5960005 | Method and device for two-way communication network | Umihiko Moteki, Masaharu Matsumoto, Yutaka Suzuki, Yuji Maeda, Yoshihide Morimoto +1 more | 1999-09-28 |
| 4748659 | Calling signal transmission apparatus | Kiyoshi Kasahara, Kenichi Ogawa, Kenji Takato, Shoji Nojiri, Yoshimi Iijima +3 more | 1988-05-31 |
| 4631366 | Battery feed circuit for subscriber line | Kenji Takato, Mitsutoshi Ayano, Kiyoshi Shibuya, Yoshimi Iijima | 1986-12-23 |