| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 8 | |
| #2 | United States | 3 |
| # | Industry | |
|---|---|---|
| #1 | Basic materials chemistry | |
| #2 | Machine tools | |
| #3 | Machines | |
| #4 | Chemical engineering |
| # | Technology | |
|---|---|---|
| #1 | Fuels | |
| #2 | Presses | |
| #3 | Producer gas production | |
| #4 | Gas, coke and tar production | |
| #5 | Milling | |
| #6 | Separating solids using liquids | |
| #7 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Franz Herglotz | 3 |
| Publication | Filing date | Title |
|---|---|---|
| US2236404A | Process of working up pit coal | |
| US2234644A | Method of and apparatus for briquetting fine-grained, pulverulent, or dust-fine material | |
| US2089061A | Process of producing large size coke from brown coal |