| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Belgium | 2 | |
| #2 | France | 2 | |
| #3 | United Kingdom | 2 | |
| #4 | Sweden | 2 | |
| #5 | South Africa | 2 | |
| #6 | Canada | 1 | |
| #7 | Switzerland | 1 | |
| #8 | Germany | 1 | |
| #9 | Hong Kong | 1 | |
| #10 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Materials and metallurgy | |
| #2 | Chemical engineering | |
| #3 | Engines, pumps and turbines | |
| #4 | Thermal processes |
| # | Technology | |
|---|---|---|
| #1 | Non-metallic elements | |
| #2 | Building materials | |
| #3 | Separation | |
| #4 | Air-conditioning | |
| #5 | Non-positive-displacement pumps | |
| #6 | Supplying combustion engines |
| # | Name | Total Patents |
|---|---|---|
| #1 | Bedford J | 3 |
| #2 | Shipman P V | 2 |
| #3 | Redfarn C | 2 |
| #4 | Bedford John | 2 |
| #5 | Foreman Christopher Roy | 1 |
| #6 | Redfarn Cyril A | 1 |
| #7 | Foreman C R | 1 |
| #8 | Foreman C | 1 |
| #9 | Redfarn C A | 1 |
| #10 | Aubrey Redfarn Cyril | 1 |
| Publication | Filing date | Title |
|---|---|---|
| CA940108A | Conglomeration of particulate adsorbtive or absorbtive materials | |
| ZA7003841B | A power driven air filter | |
| US3676985A | Power-driven air filter | |
| GB1346762A | Power driven air filter | |
| GB1311278A | Conglomeration of particulate adsorptive or absorptive materials |