Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7233470 | Distance relay apparatus | Takahiro Kase, Tetsuo Matsushima | 2007-06-19 |
| 7106565 | Directional ground relay system | Takahiro Kase, Yasutaka Sonobe | 2006-09-12 |
| 6989977 | Digital directional relay | Takahiro Kase, Yasutaka Sonobe | 2006-01-24 |
| 6937453 | Directional comparison distance relay system | Takahiro Kase, Yasutaka Sonobe | 2005-08-30 |
| 6906903 | Protection relay | Yasuhiro Kurosawa, Hideyuki Takani | 2005-06-14 |
| 6873508 | Protective relay system | Takahiro Kase, Yasutaka Sonobe | 2005-03-29 |
| 6498709 | Digital distance relay | Yasuhiro Kurosawa, Tetsuo Matsushima, Hiroshi Saito | 2002-12-24 |