| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Switzerland | 8 | |
| #2 | Austria | 7 | |
| #3 | Germany | 4 | |
| #4 | Spain | 2 | |
| #5 | France | 2 | |
| #6 | Italy | 2 | |
| #7 | WIPO (World Intellectual Property Organization) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Environmental technology | |
| #2 | Civil engineering | |
| #3 | Chemical engineering | |
| #4 | Machines |
| # | Name | Total Patents |
|---|---|---|
| #1 | Oestreicher Friedrich | 8 |
| #2 | Friedrich Oestreicher | 4 |
| #3 | Differenz Friedrich Dipl Ing | 1 |
| #4 | Oestreicher Friedrich Ing | 1 |
| #5 | Koser Jaroslav | 1 |
| #6 | Dipl-Ing Seltenhammer Ludwig D | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE2446289A1 | PROCESS AND SYSTEM FOR THE PURIFICATION OF WASTEWATER USING REVITALIZED SLUDGE | |
| DE1658102A1 | Biological treatment plant based on the activated sludge process | |
| ES218282A1 | A procedure for draining clarifying gases built with prefabricated parts (Machine-translation by Google Translate, not legally binding) | |
| ES216547A1 | Procedure for the construction of channel conductions (Machine-translation by Google Translate, not legally binding) |