| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 3 | |
| #2 | Switzerland | 2 | |
| #3 | Norway | 2 | |
| #4 | United States | 2 | |
| #5 | Austria | 1 | |
| #6 | Brazil | 1 | |
| #7 | Finland | 1 | |
| #8 | United Kingdom | 1 | |
| #9 | Hong Kong | 1 | |
| #10 | Ireland | 1 | |
| #11 | India | 1 | |
| #12 | Italy | 1 | |
| #13 | Japan | 1 | |
| #14 | Mexico | 1 | |
| #15 | Sweden | 1 | |
| #16 | Singapore | 1 | |
| #17 | USSR (Union of Socialist Soviet Republics) | 1 | |
| #18 | South Africa | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Engines, pumps and turbines | |
| #3 | Machine tools |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Pumps | |
| #3 | Rotary pistons | |
| #4 | Rotary-pistons | |
| #5 | Making gears or toothed racks |
| # | Name | Total Patents |
|---|---|---|
| #1 | Persson Jan Edvard | 16 |
| #2 | Persson Yan Edvard | 1 |
| #3 | Jan Edvard Persson | 1 |
| #4 | Yan Edobarudo Perutsuson | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE3535376A1 | COUPLING BETWEEN A DRILLING TOOL AND A DRILL SHAFT | |
| GB8422291D0 | A drill arrangement | |
| SU912055A3 | Pump | |
| DE2601831A1 | PUMPING DEVICE | |
| US3640649A | Screw rotors |