| # | Country | Total Patents | |
|---|---|---|---|
| #1 | WIPO (World Intellectual Property Organization) | 5 | |
| #2 | Germany | 4 | |
| #3 | EPO (European Patent Office) | 4 | |
| #4 | China | 2 | |
| #5 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Electrical machinery and energy |
| # | Technology | |
|---|---|---|
| #1 | Internal-combustion piston engines | |
| #2 | Machines | |
| #3 | Dynamo-electric machines | |
| #4 | Electric motor controls | |
| #5 | Controlling combustion engines |
| # | Name | Total Patents |
|---|---|---|
| #1 | Graef Juergen | 7 |
| #2 | Pohl Sven-Erik | 4 |
| #3 | Graef Markus | 4 |
| #4 | Gräf Jürgen | 3 |
| #5 | Gräf Markus Dr | 2 |
| #6 | Ferrari Cornelius | 2 |
| #7 | Scherello Michael | 1 |
| #8 | Juergen Graef | 1 |
| #9 | Graef Markus Dr | 1 |
| #10 | Cornelius Ferrari | 1 |
| Publication | Filing date | Title |
|---|---|---|
| WO2010031587A2 | Rotor for a linear actuator, used in combination with an internal combustion engine | |
| DE102008053068A1 | Variable stroke free piston engine, method of operating a free piston engine and use of orifices in a piston receiver | |
| DE102008053069A1 | Free piston engine with variable stroke and method of operating a free piston engine | |
| DE102008030633A1 | Method for operating a free-piston device | |
| DE102007035914A1 | Free piston device and method for controlling and / or regulating a free piston device |