Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6988896 | Monitor top typed simulation system and method for studying based on internet | — | 2006-01-24 |
| 6979197 | Globe apparatus for showing rotation and revolution | Ju-Hyung Cho | 2005-12-27 |