| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Austria | 3 | |
| #2 | Spain | 3 | |
| #3 | Canada | 1 | |
| #4 | Switzerland | 1 | |
| #5 | Denmark | 1 | |
| #6 | United Kingdom | 1 | |
| #7 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Thermal processes |
| # | Technology | |
|---|---|---|
| #1 | Preheating for stem generation |
| # | Name | Total Patents |
|---|---|---|
| #1 | Kunert Otto | 8 |
| Publication | Filing date | Title |
|---|---|---|
| US829970A | Water-circulating device. | |
| CA98257A | Steam boiler | |
| GB190520703A | Improvements in Means for Producing Automatic Counter Currents and Water Circulation in Steam Boilers. |