Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6887555 | Floor covering based on perforated PVC sheet | Hyeong-Keor Yoo | 2005-05-03 |
| 6733888 | Floor-covering material using phenol composite resin | Chang-guen Lee, Hyeong-Keor Yoo, Sung-Il Kim | 2004-05-11 |