Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5661601 | Projection method and projection system and mask therefor | Ho-young Kang, Cheol Kim, Seong-oon Choi, Chang-jin Sohn | 1997-08-26 |
| 5608576 | Projection method and projection system and mask therefor | Chang-jin Sohn, Ho-young Kang, Cheol Kim, Seong-oon Choi | 1997-03-04 |