| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Austria | 9 | |
| #2 | Switzerland | 3 | |
| #3 | Denmark | 3 | |
| #4 | United States | 3 |
| # | Industry | |
|---|---|---|
| #1 | Materials and metallurgy | |
| #2 | Environmental technology | |
| #3 | Thermal processes |
| # | Technology | |
|---|---|---|
| #1 | Metal tempering | |
| #2 | Cremation furnaces | |
| #3 | Furnaces |
| # | Name | Total Patents |
|---|---|---|
| #1 | Siemens Friedrich | 18 |
| Publication | Filing date | Title |
|---|---|---|
| US1102359A | Regenerative furnace. | |
| US1098985A | Furnace. | |
| US1017181A | Furnace. |