| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 11 | |
| #2 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Materials and metallurgy | |
| #2 | Thermal processes | |
| #3 | Electrical machinery and energy | |
| #4 | Surface technology and coating | |
| #5 | Machines | |
| #6 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Building materials | |
| #2 | Furnaces | |
| #3 | General building constructions | |
| #4 | Details of furnaces | |
| #5 | Metal enamelling | |
| #6 | Manufacturing processes | |
| #7 | Special electric heating or lighting |
| Publication | Filing date | Title |
|---|---|---|
| GB221852A | Refractory mass, articles and the like |