Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10975561 | Method and device for controlling ventilation amount with respect to sealed pipe | Shi Cheal Shin, Kyu Chui Jung, Jae Wang Chung | 2021-04-13 |
| 8834613 | Bad odor removal system for sewage pipe | Sung Chang Hong, Shi Cheol Shin, Sun Tae Kim | 2014-09-16 |