| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Denmark | 4 | |
| #2 | France | 3 | |
| #3 | United Kingdom | 3 | |
| #4 | Germany | 2 |
| # | Industry | |
|---|---|---|
| #1 | Materials and metallurgy | |
| #2 | Thermal processes | |
| #3 | Packaging and shipping | |
| #4 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Non-metallic elements | |
| #2 | Furnaces | |
| #3 | Metal production and refining | |
| #4 | Transport or storage devices | |
| #5 | Dredging |
| Publication | Filing date | Title |
|---|---|---|
| GB445234A | Improvements in or relating to mechanical roasting furnaces | |
| GB359368A | Improvements in or relating to reaction towers for the manufacture of sulphuric acid | |
| GB344679A | Improvements in or relating to machines for handling superphosphate or like material | |
| DE506982C | Device for conveying roast or fuel in mechanical roasting ovens with several floors | |
| DE380140C | Process and device for automatic control of the supply of oxidizing agents into the reaction tower during the production of sulfuric acid |