| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Switzerland | 9 | |
| #2 | Canada | 1 | |
| #3 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Control | |
| #2 | Thermal processes |
| # | Technology | |
|---|---|---|
| #1 | Systems controlling non-electric variables | |
| #2 | Heat-exchanger without contact | |
| #3 | Steam generation |
| # | Name | Total Patents |
|---|---|---|
| #1 | Weltert Franz | 8 |
| #2 | Franz Weltert | 3 |
| Publication | Filing date | Title |
|---|---|---|
| GB130458A | Improvements in or relating to Controlling Devices for Heating and Ventilating Plants. | |
| CA206967A | Controlling device for heating and ventilating plants |