| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 13 |
| # | Industry | |
|---|---|---|
| #1 | Basic materials chemistry | |
| #2 | Machines | |
| #3 | Materials and metallurgy | |
| #4 | Thermal processes | |
| #5 | Chemical engineering | |
| #6 | Engines, pumps and turbines | |
| #7 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Manufacturing processes | |
| #2 | Liquid hydrocarbon mixture production | |
| #3 | Furnaces | |
| #4 | Purifying gas composition | |
| #5 | Lubricating | |
| #6 | Building materials | |
| #7 | Non-metallic elements | |
| #8 | Lubricating of machines | |
| #9 | Working-up pitch | |
| #10 | Chemical or physical processes |