Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9825439 | Withdrawable interlock device of vacuum circuit breaker | Hong Ik Yang, Han-Joo Lee, Kil Young Ahn | 2017-11-21 |
| 9425590 | Withdrawable-type circuit breaker | Hong Ik Yang, Kil Young Ahn, Seung Pil Yang, Seung Hwan Mun | 2016-08-23 |