| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 3 | |
| #2 | WIPO (World Intellectual Property Organization) | 3 | |
| #3 | Austria | 2 | |
| #4 | Australia | 2 | |
| #5 | Switzerland | 2 | |
| #6 | EPO (European Patent Office) | 2 | |
| #7 | Canada | 1 | |
| #8 | German Democratic Republic | 1 | |
| #9 | Denmark | 1 | |
| #10 | Spain | 1 | |
| #11 | France | 1 | |
| #12 | United Kingdom | 1 | |
| #13 | Ireland | 1 | |
| #14 | Italy | 1 | |
| #15 | Mexico | 1 | |
| #16 | Sweden | 1 | |
| #17 | United States | 1 | |
| #18 | Yugoslavia (Serbia and Montenegro) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Internal-combustion piston engines | |
| #2 | Pumps | |
| #3 | Starting of combustion engines |
| # | Name | Total Patents |
|---|---|---|
| #1 | Stelzer Frank | 20 |
| #2 | Frank Stelzer | 2 |
| Publication | Filing date | Title |
|---|---|---|
| AU2003210416A1 | Device for transporting fluids | |
| DE4090967D2 | Anlasser fuer einen einen freifliegenden stufenkolben aufweisenden motor | |
| EP0208683A1 | Hydraulic pump | |
| DE3029287A1 | TWO-STROKE COMBUSTION ENGINE |