Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7579712 | Power system protection system | Ken Yanagihashi, Mamoru Suzuki, Takafumi Maeda, Akira Ishibashi | 2009-08-25 |
| 5293295 | Digital protective relay apparatus | — | 1994-03-08 |