Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5904836 | High-vacuum oil refinery system and process | Dae Sung Lee | 1999-05-18 |
| 5548906 | Vaporizing and concentration drying apparatus and method | Dae Sung Lee | 1996-08-27 |
| 5241815 | Heat-recovering-thrust-turbine having rotational flow path | Dae Sung Lee | 1993-09-07 |
| 5224431 | Burner device utilizing combustible wastes as fuel | Dae Sung Lee | 1993-07-06 |