| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 69 | |
| #2 | Austria | 35 | |
| #3 | Switzerland | 33 | |
| #4 | France | 19 | |
| #5 | Denmark | 9 | |
| #6 | United Kingdom | 4 | |
| #7 | Belgium | 2 | |
| #8 | Ireland | 2 | |
| #9 | Norway | 2 | |
| #10 | United States | 2 | |
| #11 | Canada | 1 | |
| #12 | Spain | 1 | |
| #13 | Finland | 1 | |
| #14 | Italy | 1 | |
| #15 | Sweden | 1 |
| # | Industry | |
|---|---|---|
| #1 | Thermal processes | |
| #2 | Environmental technology |
| # | Name | Total Patents |
|---|---|---|
| #1 | Kraemer Friedrich | 19 |
| #2 | Beschraenkter Haftung Strebelw | 10 |
| #3 | Kruepe Dr-Ing Ernst | 7 |
| #4 | Muhle Juergen | 6 |
| #5 | Nauert Kurt | 6 |
| #6 | Dr Wegener Wilhelm Ing | 5 |
| #7 | Wagner Guenther Dipl-Ing | 4 |
| #8 | Dr Kruepe Ernst Ing | 4 |
| #9 | Becker Eduard Dipl Ing | 3 |
| #10 | Kurt Nauert | 3 |
| Publication | Filing date | Title |
|---|---|---|
| DE2240621A1 | COLLECTIVE HEATING BOILER | |
| GB1306845A | Boiler | |
| GB1272993A | Improvements in or relating to heat exchangers for example for boilers | |
| GB1246816A | Improvements in or relating to sectional central heating boilers | |
| DE1779789B1 | Thermal storage boiler | |
| DE1779296B1 | Heating system with electric storage boiler | |
| DE968697C | Device for secondary air supply for collective heating sectional boiler | |
| GB341809A | Improvements in sectional boilers for heating water | |
| US1234573A | Thermostatic regulator. | |
| CA896294A | Sectional boiler |