Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4819124 | Overcurrent detector and circuit breaker | — | 1989-04-04 |
| 4819125 | Overcurrent detector | Yoshihiro Hatakeyama | 1989-04-04 |
| 4814935 | Circuit breaker reactive to three time-overcurrent characteristics | Yoshihiro Hatakeyama | 1989-03-21 |