| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 19 |
| # | Industry | |
|---|---|---|
| #1 | Environmental technology | |
| #2 | Thermal processes | |
| #3 | Chemical engineering | |
| #4 | Control | |
| #5 | Civil engineering | |
| #6 | Measurement | |
| #7 | Surface technology and coating | |
| #8 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Domestic heating systems | |
| #2 | Water treatment | |
| #3 | Mixing | |
| #4 | Installations for obtaining water | |
| #5 | Systems controlling non-electric variables | |
| #6 | Separation | |
| #7 | Measuring volume | |
| #8 | Pipes | |
| #9 | Coating metallic material |