| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 10 | |
| #2 | United Kingdom | 1 | |
| #3 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering | |
| #2 | Engines, pumps and turbines | |
| #3 | Environmental technology |
| # | Technology | |
|---|---|---|
| #1 | Flotation | |
| #2 | Separating solids using liquids | |
| #3 | Pumps | |
| #4 | Water treatment | |
| #5 | Non-positive-displacement pumps | |
| #6 | Separation |
| # | Name | Total Patents |
|---|---|---|
| #1 | Theodor Franz | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1769217A | Process for dressing coal, lignite, and like materials | |
| GB240799A | Improvements in or relating to processes for dressing coal, lignite and like materials |