| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Switzerland | 9 | |
| #2 | EPO (European Patent Office) | 6 | |
| #3 | Austria | 4 | |
| #4 | France | 3 | |
| #5 | Germany | 2 | |
| #6 | Italy | 1 |
| # | Industry | |
|---|---|---|
| #1 | Thermal processes | |
| #2 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Domestic stoves for solid fuels | |
| #2 | Domestic heating systems | |
| #3 | Non-positive-displacement pumps | |
| #4 | Fluid heaters |
| # | Name | Total Patents |
|---|---|---|
| #1 | Frei Martin | 18 |
| #2 | Martin Frei | 1 |
| Publication | Filing date | Title |
|---|---|---|
| CH694406A5 | Fireplace hearth. | |
| EP0840073A2 | Warm-air heating apparatus | |
| CH692754A5 | Warm air heater. | |
| CH691080A5 | Housing for open fireplace | |
| CH690859A5 | Fireplace. | |
| EP0559619A1 | Fireplace with primary and secondary air supply | |
| EP0559618A1 | Hot air fireplace | |
| CH685723A5 | Hollow heating brick | |
| CH684608A5 | Fireplace. | |
| EP0480870A1 | Fireplace | |
| CH677697A5 | Furnace with movable glass windows | |
| CH662170A5 | Cheminee system with warm air generation. | |
| CH646506A5 | Cheminee. |