| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 9 | |
| #2 | United Kingdom | 2 | |
| #3 | France | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Environmental technology | |
| #3 | Consumer goods | |
| #4 | Machine tools | |
| #5 | Textiles and paper | |
| #6 | Machines | |
| #7 | Transport |
| # | Name | Total Patents |
|---|---|---|
| #1 | Metzler Ferdinand | 3 |
| Publication | Filing date | Title |
|---|---|---|
| DE738431C | Self-igniting or externally igniting air-compressing internal combustion engine | |
| DE637343C | Device for steam charging in internal combustion engines | |
| DE605651C | Internal combustion engine in which steam is introduced into the working cylinder via a valve during the compression stroke | |
| GB385889A | Improvements in and relating to gas turbines | |
| GB382676A | Improvements in and relating to turbines |