| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 2 | |
| #2 | France | 2 | |
| #3 | United States | 2 | |
| #4 | Australia | 1 | |
| #5 | Canada | 1 | |
| #6 | Spain | 1 | |
| #7 | United Kingdom | 1 | |
| #8 | Italy | 1 | |
| #9 | Japan | 1 | |
| #10 | Sweden | 1 | |
| #11 | South Africa | 1 |
| # | Industry | |
|---|---|---|
| #1 | Thermal processes | |
| #2 | Chemical engineering | |
| #3 | Machines | |
| #4 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Domestic stoves | |
| #2 | Separation | |
| #3 | Unspecified technologies | |
| #4 | Air-conditioning | |
| #5 | Fire-fighting |
| # | Name | Total Patents |
|---|---|---|
| #1 | Doane Dewitt H | 3 |
| #2 | Greco T | 2 |
| #3 | Greco Thomas | 2 |
| #4 | Toomasu Gureko | 1 |
| #5 | Walters J | 1 |
| Publication | Filing date | Title |
|---|---|---|
| ZA7704192B | Grease filter for kitchen ventilating systems | |
| US3821924A | Damper mechanism for kitchen ventilating systems | |
| US3893831A | Grease extractor for kitchen ventilating systems |