| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Austria | 1 | |
| #2 | Belgium | 1 | |
| #3 | Switzerland | 1 | |
| #4 | Czechoslovakia | 1 | |
| #5 | German Democratic Republic | 1 | |
| #6 | Germany | 1 | |
| #7 | Finland | 1 | |
| #8 | France | 1 | |
| #9 | United Kingdom | 1 | |
| #10 | Hungary | 1 | |
| #11 | Italy | 1 | |
| #12 | Netherlands | 1 | |
| #13 | Norway | 1 | |
| #14 | Sweden | 1 | |
| #15 | USSR (Union of Socialist Soviet Republics) | 1 | |
| #16 | United States | 1 | |
| #17 | Yugoslavia (Serbia and Montenegro) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Environmental technology | |
| #2 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Swimming pools | |
| #2 | Water treatment |
| # | Name | Total Patents |
|---|---|---|
| #1 | Kaas Povl | 11 |
| #2 | Kaas P | 3 |
| Publication | Filing date | Title |
|---|---|---|
| BE883521A | Method and device for purifying water in a pool | |
| CS216673B2 | Method of cleaning the chlorinated water in the swimming pool and device for executing the said method |