Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6290771 | Activated koalin powder compound for mixing with cement and method of preparing the same | Hey-Zoo Hwang, Jung Ha Hwang, Hee Sung Cha, Kwang-Choon Kim, Jong Kuk Lee | 2001-09-18 |
| 5976241 | Activated kaolin powder compound for mixing with cement and method of preparing the same | Hey-Zoo Hwang, Jung Ha Hwang, Hee Sung Cha, Kwang-Choon Kim, Jong Kuk Lee | 1999-11-02 |