| 17 |
Construction method for culverts and utility-pipe conduits using pipe-rack modules |
China 200710107354.6 |
2009. 4. |
| 16 |
Metal oxide catalysts |
USA 7566440 |
2009. 7. |
| 15 |
Batch style wastewater treatment apparatus using biological filtering process and wastewater treatment method using the same process. (Biofilter) |
Japan 4125941 |
2008. 5. |
| 14 |
Cobalt Oxide Catalysts
|
USA 7309479 |
2007. 12. |
| 13 |
Wastewater Treatment Apparatus and Method for Removing Nitrogen and Phosphorus
|
China 02828376.7 |
2007. 3. |
| 12 |
Wastewater Treatment Apparatus and Method for Removing Nitrogen and Phosphorus
|
USA 7195712 |
2007. 3. |
| 11 |
Wastewater Treatment Method For Removing Organic Matter And Nitrogen, Carrier Used Thereof And Method For Manufacturing The Carrier
|
Spain 2 253 878 |
2006. 6. |
|
Sustainability
