| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 28 | |
| #2 | Germany | 2 | |
| #3 | Switzerland | 1 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering | |
| #2 | Environmental technology | |
| #3 | Control | |
| #4 | Measurement | |
| #5 | Mechanical elements | |
| #6 | Engines, pumps and turbines | |
| #7 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Water treatment | |
| #2 | Separation | |
| #3 | Systems controlling non-electric variables | |
| #4 | Chemical or physical processes | |
| #5 | Pistons and sealings | |
| #6 | Measuring volume | |
| #7 | Time-interval measuring | |
| #8 | Pipes | |
| #9 | Shaping of plastics | |
| #10 | Pumps |
| # | Name | Total Patents |
|---|---|---|
| #1 | Leviel Roger | 8 |
| #2 | Croce-Spinelli Paul | 5 |
| #3 | Guyard Paul | 4 |
| #4 | Spinelli Paul Croce | 1 |
| #5 | Paul Croce-Spinelli | 1 |
| #6 | Kaiser Marcel | 1 |
| #7 | Duflo Pierre | 1 |
| #8 | Roger Leviel | 1 |
| #9 | Reibell Paul | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE1254095B | Process for water treatment by sludge bed filtratin |