| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 39 | |
| #2 | United Kingdom | 5 |
| # | Industry | |
|---|---|---|
| #1 | Thermal processes | |
| #2 | Electrical machinery and energy | |
| #3 | Materials and metallurgy | |
| #4 | Machines | |
| #5 | Agriculture |
| # | Technology | |
|---|---|---|
| #1 | Special electric heating or lighting | |
| #2 | Details of furnaces | |
| #3 | Furnaces | |
| #4 | Metal tempering | |
| #5 | Special furnaces and ovens | |
| #6 | Animal care | |
| #7 | Foundry moulding | |
| #8 | Manufacturing processes | |
| #9 | Metal production and refining |
| Publication | Filing date | Title |
|---|---|---|
| GB400524A | Improvements in or relating to aluminium-melting furnaces | |
| GB401584A | Improvements in or relating to furnaces for heating wire and the like | |
| GB370628A | Electric resistance furnace | |
| GB305388A | Induction furnace | |
| GB306172A | Induction furnaces |