Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6340625 | Method for simultaneously forming thinner and thicker parts of a dual oxide layer having varying thicknesses | Sang-Kook Choi, Kyung Hawn Cho, Won Sik An | 2002-01-22 |
| 6207588 | Method for simultaneously forming thinner and thicker parts of a dual oxide layer having varying thicknesses | Sang-Kook Choi, Kyung Hawn Cho, Won Sik An | 2001-03-27 |
| 5711808 | Boat for vertical diffusion furnace | Jong-Moon Yang, Sang-Woon Kim, Choung-bae Park | 1998-01-27 |
| 5704984 | Chemical vapor deposition apparatus with a heat radiation structure | Nam-Jin LEE, Sang-Kook Choi, Hyeog Joon Ko | 1998-01-06 |
| 5616025 | Vertical diffusion furnace having improved gas flow | Sang-Kook Choi, Hong-Keun Kim | 1997-04-01 |