| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 4 | |
| #2 | United Kingdom | 3 | |
| #3 | Switzerland | 2 | |
| #4 | Austria | 1 | |
| #5 | France | 1 |
| # | Industry | |
|---|---|---|
| #1 | Materials and metallurgy | |
| #2 | Chemical engineering | |
| #3 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Building materials | |
| #2 | Separation | |
| #3 | Supplying combustion engines |
| # | Name | Total Patents |
|---|---|---|
| #1 | Schumacher Sche Fabrik G M B H | 2 |
| Publication | Filing date | Title |
|---|---|---|
| GB391927A | Improved filter for air or gases | |
| GB251964A | Improved manufacture of porous artificial stone | |
| GB251965A | Improved manufacture of artificial filter stones |