| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 10 | |
| #2 | United Kingdom | 3 | |
| #3 | France | 2 | |
| #4 | United States | 2 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering | |
| #2 | Civil engineering | |
| #3 | Thermal processes | |
| #4 | Furniture and games |
| # | Name | Total Patents |
|---|---|---|
| #1 | Oswald Pfeiffer | 2 |
| #2 | Pfeiffer Oswald | 2 |
| Publication | Filing date | Title |
|---|---|---|
| GB341587A | Improvements in or relating to drying apparatus | |
| US1612771A | Collapsible grid | |
| GB261309A | Improvements in collapsible grids | |
| US1462621A | Apparatus for drying material | |
| GB148873A | Air heater for drying plants | |
| DE353159C | Air heater |