| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Sweden | 4 | |
| #2 | Canada | 2 | |
| #3 | Germany | 2 | |
| #4 | Austria | 1 | |
| #5 | Denmark | 1 | |
| #6 | Finland | 1 | |
| #7 | United Kingdom | 1 | |
| #8 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Environmental technology | |
| #3 | Chemical engineering |
| # | Technology | |
|---|---|---|
| #1 | Hydraulic engineering | |
| #2 | Water treatment | |
| #3 | Climate change mitigation in wastewater treatment | |
| #4 | Separating solids | |
| #5 | Separation | |
| #6 | Mixing |
| # | Name | Total Patents |
|---|---|---|
| #1 | Oestnaes L | 2 |
| #2 | Ostnas Lars-Olof Lennart | 2 |
| #3 | Ostnas Lars-Olof L | 1 |
| #4 | Ostnes L O L | 1 |
| #5 | Oestnaes | 1 |
| #6 | Boerje Hellman Carl Johan | 1 |
| #7 | Lennart Oestnaes Lars-Olof | 1 |
| #8 | Oestnaes Lars-Olaf Lennart | 1 |
| #9 | Hellman B | 1 |
| #10 | Hellman Carl J B | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE1934070A1 | Sludge deposit scraper arrangement for circular - settling basins | |
| US3482698A | Arrangement for cleaning gratings,grids,racks,etc. | |
| CA855530A | Arrangement for cleaning gratings, grids, racks, etc. | |
| CA874567A | Scraper means for removing sludge from sedimentation tanks |