| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 9 | |
| #2 | United Kingdom | 2 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering | |
| #2 | Thermal processes |
| # | Technology | |
|---|---|---|
| #1 | Separation | |
| #2 | Magnetic or electrostatic solid separation | |
| #3 | Heat-exchange device details |
| # | Name | Total Patents |
|---|---|---|
| #1 | Schirp Aloys | 2 |
| #2 | Overbeck Fritz | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB365723A | Filter for cleaning air and gases | |
| GB303740A | A rotatable air or gas filter of the plate type |