| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 7 | |
| #2 | France | 3 | |
| #3 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Thermal processes | |
| #2 | Materials and metallurgy |
| # | Technology | |
|---|---|---|
| #1 | Heat-exchanger without contact | |
| #2 | Iron and steel production | |
| #3 | Heat-exchange device details | |
| #4 | Metal tempering | |
| #5 | Burners | |
| #6 | Casings for combustion chambers | |
| #7 | Details of furnaces | |
| #8 | Furnaces |
| # | Name | Total Patents |
|---|---|---|
| #1 | Alfred Schack | 1 |
| #2 | Altland Guenter | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2134804A | Air heater for blast furnaces | |
| DE673072C | Steel melting furnace plant | |
| DE578236C | Heat exchanger with metal tubes arranged vertically |