| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Denmark | 3 | |
| #2 | Netherlands | 3 | |
| #3 | Austria | 2 | |
| #4 | Germany | 2 | |
| #5 | France | 2 | |
| #6 | United Kingdom | 1 | |
| #7 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Measurement | |
| #2 | Thermal processes | |
| #3 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Measuring temperature | |
| #2 | Domestic heating systems | |
| #3 | Heat-exchanger without contact | |
| #4 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Petersen Viggo Stephan Kellner | 9 |
| Publication | Filing date | Title |
|---|---|---|
| GB104184A | Improvements in Method and Apparatus for Measuring Heat Calories, especially the Quantities of Heat from Radiators, Hot Water Cocks, Steam Cocks, and the like, in Central Heating Plants. | |
| US1273404A | Milk-cooling apparatus. |