| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 36 | |
| #2 | Spain | 2 | |
| #3 | United Kingdom | 1 | |
| #4 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering | |
| #2 | Environmental technology | |
| #3 | Control | |
| #4 | Civil engineering | |
| #5 | Measurement | |
| #6 | Mechanical elements |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hardy Pierre P E | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB693101A | Improvements in automatic systems for adjusting a filtration plant, operated by the filtered water requirement | |
| US2601137A | Filtration plant flow control responsive to demand |