Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D477207 | Grinding cup | Joon Ho Chang | 2003-07-15 |
| D474954 | Grinding cup | Joon Ho Chang | 2003-05-27 |
| 6564887 | Core drill | Jae Hyun Hong, Chang-Hyun Lee | 2003-05-20 |
| D466139 | Core drill | Joon Ho Chang | 2002-11-26 |
| D460767 | Saw blade | Jang Hyuk Ahn | 2002-07-23 |
| D459374 | Saw blade | — | 2002-06-25 |
| D456425 | Segment tip for saw blade | — | 2002-04-30 |