| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 5 | |
| #2 | United Kingdom | 4 | |
| #3 | United States | 2 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Mechanical elements | |
| #3 | Transport |
| # | Technology | |
|---|---|---|
| #1 | Pistons and sealings | |
| #2 | Cylinders for combustion engines | |
| #3 | Special machines | |
| #4 | Convertible vehicles |
| # | Name | Total Patents |
|---|---|---|
| #1 | Keune Albert | 4 |
| #2 | Borrmann Waldemar | 4 |
| #3 | Waldemar Borrmann | 2 |
| #4 | Albert Keune | 1 |
| #5 | Friedrich Ahrens | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2145845A | Piston for internal combustion engines | |
| GB500307A | Piston for internal combustion engines | |
| GB498123A | Piston ring closure for internal combustion engines | |
| GB466445A | Improvements in land and water vehicles | |
| GB413520A | Piston for internal combustion engines | |
| US2012373A | Piston for internal combustion engines |