Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5796630 | Protective relay system provided with difference and addition filters | Takafumi Maeda, Hiroshi Yamakawa, Mitsuru Yamaura, Yasuhiro Kurosawa | 1998-08-18 |
| 4825326 | Digital calculation type differential relay | Noriyoshi Suga | 1989-04-25 |
| 4803635 | Information data output device for electric-power systems | — | 1989-02-07 |
| 4774621 | Protective control method and apparatus | — | 1988-09-27 |
| 4561120 | Protective relaying system | Junichi Inagaki | 1985-12-24 |
| 4541058 | Protective relay system | Mitsuru Yamaura, Ryotaro Kondow | 1985-09-10 |
| 4511981 | Protective relaying system | Masuo Nakashima | 1985-04-16 |
| 4507700 | Protective relaying system | Yuji Okita, Noriyoshi Suga | 1985-03-26 |
| 4484246 | Reclosing device for transmission line | — | 1984-11-20 |
| 4371908 | Digital protective relaying systems | Takayuki Kobayashi, Ryotaro Kondow, Yoshiji Nii | 1983-02-01 |
| 4370571 | Relay device | Norio Fujisawa | 1983-01-25 |
| 4309767 | Monitor system for a digital signal | Kyotaro Kondow, Eiichi Okamoto | 1982-01-05 |
| 4212046 | Distance relaying systems | Tetsuo Matsushima, Eiichi Okamoto | 1980-07-08 |