| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 34 | |
| #2 | United Kingdom | 6 | |
| #3 | France | 5 | |
| #4 | United States | 3 | |
| #5 | Austria | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Environmental technology | |
| #3 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Rotary pistons | |
| #2 | Rotary-pistons | |
| #3 | Pumps | |
| #4 | Internal-combustion piston engines | |
| #5 | Climate change mitigation in transportation | |
| #6 | Pistons and sealings |
| # | Name | Total Patents |
|---|---|---|
| #1 | Heinrich Hugo | 6 |
| #2 | Hugo Heinrich | 4 |
| Publication | Filing date | Title |
|---|---|---|
| GB384588A | Improvements in or relating to machines with crescent-shaped working space | |
| US1762983A | Engine, pump, compressor, and the like | |
| GB269897A | Rotary engine or the like | |
| GB270672A | Rotary engine or the like | |
| US1658803A | Engine, pump, compressor, and the like | |
| GB262132A | Improvements in rotary engines, pumps, and the like | |
| US1505094A | Rotary engine, pump, and the like |