| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Japan | 3 | |
| #2 | Canada | 2 | |
| #3 | Germany | 2 | |
| #4 | Finland | 2 | |
| #5 | France | 2 | |
| #6 | United Kingdom | 2 | |
| #7 | Italy | 2 | |
| #8 | United States | 2 | |
| #9 | Brazil | 1 | |
| #10 | Sweden | 1 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Textiles and paper |
| # | Technology | |
|---|---|---|
| #1 | Cyclones | |
| #2 | Treatment of paper-making materials |
| # | Name | Total Patents |
|---|---|---|
| #1 | Skardal Karl A | 4 |
| #2 | Skardal Karl Arvid | 4 |
| #3 | Karuru Arubito Sukarudaru | 1 |
| #4 | Skardal K | 1 |
| #5 | Liin S | 1 |
| #6 | Kaaru Arubido Sukarudaru | 1 |
| #7 | Kaaru Arubito Sukarudaru | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US4224145A | Vortex cleaner | |
| US4156485A | Vortex cleaner | |
| JPS5362272A | Swirl type separator |