| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Australia | 8 | |
| #2 | United Kingdom | 4 | |
| #3 | Brazil | 1 | |
| #4 | United States | 1 | |
| #5 | South Africa | 1 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering | |
| #2 | Machines | |
| #3 | Thermal processes | |
| #4 | Environmental technology |
| # | Name | Total Patents |
|---|---|---|
| #1 | Margraf Adolf | 8 |
| #2 | Margraf A | 3 |
| Publication | Filing date | Title |
|---|---|---|
| AU1210183A | Bag filter | |
| GB1540015A | Tube filters | |
| GB1441670A | Pocket filter apparatus |