| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Switzerland | 6 | |
| #2 | Germany | 6 | |
| #3 | United Kingdom | 4 | |
| #4 | Austria | 3 | |
| #5 | Belgium | 1 | |
| #6 | Canada | 1 |
| # | Industry | |
|---|---|---|
| #1 | Environmental technology | |
| #2 | Chemical engineering | |
| #3 | Civil engineering | |
| #4 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Water treatment | |
| #2 | Separation | |
| #3 | Climate change mitigation in wastewater treatment | |
| #4 | Hydraulic engineering | |
| #5 | Gas holders |
| # | Name | Total Patents |
|---|---|---|
| #1 | Johann Conrad Stengelin | 6 |
| #2 | Stengelin Johann Conrad | 5 |
| #3 | Conrad Stengelin Johann | 5 |
| #4 | Stengelin Johann C | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB1287242A | Sewage purification plant | |
| GB1267470A | Immersion trickling filter plant | |
| CH520626A | Waste water clarifying tank | |
| CH511193A | Built up semi immersed effluent filterdrum | |
| DE2003259A1 | Backwash filter system | |
| DE1484850A1 | Micro purification system | |
| CA891199A | Apparatus for biologically purifying effluent |