| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 3 | |
| #2 | Denmark | 3 | |
| #3 | South Africa | 2 | |
| #4 | Austria | 1 | |
| #5 | Belgium | 1 | |
| #6 | Canada | 1 | |
| #7 | Switzerland | 1 | |
| #8 | France | 1 | |
| #9 | United Kingdom | 1 | |
| #10 | Ireland | 1 | |
| #11 | Italy | 1 | |
| #12 | Netherlands | 1 | |
| #13 | Norway | 1 | |
| #14 | Sweden | 1 | |
| #15 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Environmental technology | |
| #2 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Climate change mitigation in wastewater treatment | |
| #2 | Water treatment | |
| #3 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Krarup Svend | 5 |
| #2 | Tholander B | 5 |
| #3 | Krarup S | 5 |
| #4 | Tholander Bent Kure | 4 |
| #5 | Tholander B K | 1 |
| #6 | Tholander Bent K | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US3977965A | Method of biological purification of sewage | |
| IE38034L | A method of biological purification of sewage and plant for carrying out the method | |
| DE2320194A1 | Biological sewage treatment plant - with three basins used alternately for aeration, settling and outflow | |
| DE2164454A1 | Effluent purificn plant - with channels alternately acting as aerating and settling zones |