Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6113788 | Wastewater treatment process | Sungtai Kim | 2000-09-05 |
| 5853588 | Wastewater treatment process | Zuwhan Yun, Sungtai Kim | 1998-12-29 |
| 5733455 | Wastewater treatment process | Zuwahn Yun | 1998-03-31 |
| 5651891 | Wastewater treatment process | Sungtai Kim | 1997-07-29 |
| 5128040 | Wastewater treatment process | Zuwhan Yun | 1992-07-07 |
| 4198296 | Process and apparatus for treating drinking water | John Doumas, Gordon H. Raymond, Lee Wikstrom | 1980-04-15 |