Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10066637 | Impeller for centrifugal fan and centrifugal fan | Tomoaki Nakano | 2018-09-04 |
| 6906903 | Protection relay | Hidenari Amo, Hideyuki Takani | 2005-06-14 |
| 6498709 | Digital distance relay | Tetsuo Matsushima, Hidenari Amo, Hiroshi Saito | 2002-12-24 |
| 6459960 | Distance relay equipment | Itsuo Shuto, Hidenori Amou | 2002-10-01 |
| 6097280 | Fault locator that uses positive-phase-sequence electricity | Akio Takeda | 2000-08-01 |
| 5796630 | Protective relay system provided with difference and addition filters | Takafumi Maeda, Hiroshi Yamakawa, Fumio Andow, Mitsuru Yamaura | 1998-08-18 |
| 5523675 | Method and an apparatus for detecting a frequency of a power system | — | 1996-06-04 |
| 4344143 | Digital type distance relay system | Tetsuo Matsushima | 1982-08-10 |