| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 9 | |
| #2 | Austria | 2 | |
| #3 | Switzerland | 2 | |
| #4 | United Kingdom | 2 | |
| #5 | United States | 2 | |
| #6 | Belgium | 1 | |
| #7 | Denmark | 1 | |
| #8 | France | 1 | |
| #9 | Netherlands | 1 |
| # | Industry | |
|---|---|---|
| #1 | Machine tools | |
| #2 | Machines | |
| #3 | Thermal processes | |
| #4 | Electrical machinery and energy |
| # | Name | Total Patents |
|---|---|---|
| #1 | Roffelsen Franciscus | 16 |
| #2 | Franciscus Roffelsen | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB1235796A | Water heater | |
| DE1295177B | Device for mixing, kneading and conveying plastic masses | |
| DE1554860A1 | Screw extruder | |
| GB965488A | Improvements in and relating to heat exchange elements |