| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 2 | |
| #2 | France | 2 | |
| #3 | Italy | 2 | |
| #4 | United States | 2 | |
| #5 | Argentina | 1 | |
| #6 | Australia | 1 | |
| #7 | Belgium | 1 | |
| #8 | Switzerland | 1 | |
| #9 | United Kingdom | 1 | |
| #10 | Norway | 1 | |
| #11 | South Africa | 1 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering |
| # | Technology | |
|---|---|---|
| #1 | Separation |
| # | Name | Total Patents |
|---|---|---|
| #1 | Higgins F | 5 |
| #2 | Higgins Frank | 3 |
| Publication | Filing date | Title |
|---|---|---|
| US3850594A | Filtering method utilizing a double-wall filter bag construction | |
| AU4450172A | Double filter bag and method | |
| ZA7204734B | Double filter bag and method | |
| BE786209A | Double walled filter bag - provides increased area in given volume esp for air filter |