| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 16 | |
| #2 | United Kingdom | 2 | |
| #3 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Thermal processes | |
| #2 | Basic materials chemistry | |
| #3 | Materials and metallurgy |
| # | Technology | |
|---|---|---|
| #1 | Furnaces | |
| #2 | Producer gas production | |
| #3 | Details of furnaces | |
| #4 | Metal production and refining | |
| #5 | Fluid fuel combustion |
| # | Name | Total Patents |
|---|---|---|
| #1 | Nicola Lengersdorff | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB236229A | Improvements in and connected with furnaces and kilns | |
| GB211894A | Improvements in and connected with furnaces and kilns | |
| US1571058A | Kiln and like structure, and heat treatment |