| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 5 | |
| #2 | EPO (European Patent Office) | 3 | |
| #3 | Australia | 2 | |
| #4 | Brazil | 1 | |
| #5 | Canada | 1 | |
| #6 | Switzerland | 1 | |
| #7 | Czechoslovakia | 1 | |
| #8 | German Democratic Republic | 1 | |
| #9 | Denmark | 1 | |
| #10 | Spain | 1 | |
| #11 | France | 1 | |
| #12 | United Kingdom | 1 | |
| #13 | Hungary | 1 | |
| #14 | Ireland | 1 | |
| #15 | Italy | 1 | |
| #16 | Japan | 1 | |
| #17 | Luxembourg | 1 | |
| #18 | Netherlands | 1 | |
| #19 | Norway | 1 | |
| #20 | Poland | 1 | |
| #21 | Portugal | 1 | |
| #22 | Romania | 1 | |
| #23 | Sweden | 1 | |
| #24 | United States | 1 | |
| #25 | WIPO (World Intellectual Property Organization) | 1 | |
| #26 | Yugoslavia (Serbia and Montenegro) | 1 | |
| #27 | South Africa | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Pistons and sealings | |
| #2 | Rotary pistons | |
| #3 | Machines | |
| #4 | Internal-combustion piston engines | |
| #5 | Pumps |
| # | Name | Total Patents |
|---|---|---|
| #1 | Kathmann Peter B | 19 |
| #2 | Kathmann P | 3 |
| #3 | Kathmann P B | 2 |
| #4 | Kathmann Peter-Bernhard | 1 |
| #5 | Kathmann Peter | 1 |
| #6 | Kathmann Peter G | 1 |
| #7 | Peetaa Bee Kaatoman | 1 |
| Publication | Filing date | Title |
|---|---|---|
| AU7696887A | Rotary piston engine | |
| DE3623490A1 | Sealing device for a rotary engine | |
| DE3623489A1 | Rotating piston machine | |
| DE3508408A1 | Rotary engine | |
| CH642427A5 | Twin-rotor engine | |
| EP0007535A1 | Double-rotor rotary piston machine | |
| DE2853423A1 | SEALING BETWEEN THREE RELATIVELY MOVABLE BODIES | |
| DE2845239A1 | Rotary piston engine with coaxial rotors - each with transverse control piston oscillating about axial eccentric casing lug |