| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 7 | |
| #2 | France | 2 | |
| #3 | Switzerland | 1 | |
| #4 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Environmental technology | |
| #3 | Mechanical elements | |
| #4 | Transport | |
| #5 | Chemical engineering | |
| #6 | Consumer goods |
| # | Technology | |
|---|---|---|
| #1 | Rotary pistons | |
| #2 | Rotary-pistons | |
| #3 | Machines | |
| #4 | Pumps | |
| #5 | Climate change mitigation in transportation | |
| #6 | Internal-combustion piston engines | |
| #7 | Vehicle transmission mounting | |
| #8 | Gearing | |
| #9 | Separation | |
| #10 | Ice-boxes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Eyer Charles | 4 |
| #2 | Charles Eyer | 2 |
| #3 | Eyer C | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US3810721A | Rotary piston machine with bypass regulation | |
| DE1934262A1 | Sealing system for engines or pumps with rotating piston and / or housing | |
| DE1293784B | Rotary piston internal combustion engine |