| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Switzerland | 34 | |
| #2 | France | 10 | |
| #3 | Austria | 6 | |
| #4 | Belgium | 6 | |
| #5 | Germany | 4 | |
| #6 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Thermal processes | |
| #2 | Environmental technology |
| # | Name | Total Patents |
|---|---|---|
| #1 | Eugen Fehr | 22 |
| #2 | Fuer Oelfeuerungen Ag | 12 |
| #3 | Fehr Eugen | 4 |
| Publication | Filing date | Title |
|---|---|---|
| GB1012994A | Improved heavy-duty fluent fuel-fired hot-water boiler | |
| DE1146997B | Device for controlling the fuel supply when starting up a two-stage oil burner system | |
| DE1079307B | Automatic electrical control device for water collection heating systems | |
| DE1097110B | Oil-fired boiler for collective heating systems with a water heater arranged above the boiler | |
| DE1096580B | Boiler for pump hot water collective heating systems including hot water preparation |