| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 18 | |
| #2 | United Kingdom | 3 | |
| #3 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Thermal processes | |
| #2 | Materials and metallurgy | |
| #3 | Environmental technology | |
| #4 | Basic communication technologies | |
| #5 | Machine tools |
| # | Name | Total Patents |
|---|---|---|
| #1 | Wilhelm Schwier | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2231956A | Pit heating furnace | |
| GB514240A | Improvements in reversing valves for regeneratively fired furnaces and the like | |
| GB442026A | Improvements in and relating to the production of electric steel | |
| GB428125A | Improvements in or relating to furnaces for the heat treatment of iron and steel | |
| DE497001C | Slightly inclined slide for all types of ovens, especially regenerative ovens | |
| DE326900C | Reversing rotary bell for gas firing |