| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Sweden | 5 | |
| #2 | Norway | 4 | |
| #3 | Austria | 3 | |
| #4 | Canada | 3 | |
| #5 | Switzerland | 3 | |
| #6 | France | 3 | |
| #7 | United Kingdom | 3 | |
| #8 | Germany | 2 | |
| #9 | Belgium | 1 | |
| #10 | Brazil | 1 | |
| #11 | Denmark | 1 | |
| #12 | Spain | 1 | |
| #13 | Israel | 1 | |
| #14 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Environmental technology |
| # | Technology | |
|---|---|---|
| #1 | Climate change mitigation in wastewater treatment | |
| #2 | Water treatment |
| # | Name | Total Patents |
|---|---|---|
| #1 | Nordgard C | 7 |
| #2 | Nordgard Sigvard | 4 |
| #3 | Nordgard S | 3 |
| #4 | Hellquist A | 2 |
| #5 | Hellquist Ake | 2 |
| #6 | Sigvard Nordgard | 2 |
| #7 | Carl Sigvard Nordgard | 1 |
| #8 | Norgard S | 1 |
| #9 | Nordgard Carl Sigvard | 1 |
| #10 | Nordgard Sigrard | 1 |
| Publication | Filing date | Title |
|---|---|---|
| CA993576A | Purifying apparatus for purifying contaminated water | |
| US3688905A | Purification assembly | |
| GB1275967A | A plate element having biologically active areas for a purification system for biological purification of waste water | |
| DE1917059A1 | Purification system for organically polluted water | |
| CA905026A | Purification assembly | |
| CA877599A | Purification system for organically contaminated water |