| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 13 | |
| #2 | Germany | 11 | |
| #3 | Canada | 3 | |
| #4 | Switzerland | 2 | |
| #5 | United Kingdom | 2 | |
| #6 | Italy | 2 | |
| #7 | Sweden | 2 | |
| #8 | United States | 2 | |
| #9 | Austria | 1 | |
| #10 | Belgium | 1 |
| # | Industry | |
|---|---|---|
| #1 | Environmental technology | |
| #2 | Engines, pumps and turbines | |
| #3 | Machines | |
| #4 | Chemical engineering | |
| #5 | Thermal processes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Aoi Katashi | 17 |
| Publication | Filing date | Title |
|---|---|---|
| DE3212870A1 | Exhaust gas purification device | |
| US3999967A | Apparatus for purifying exhaust gas | |
| DE2342237A1 | EXHAUST GAS CLEANER FOR A COMBUSTION ENGINE | |
| US3860403A | Exhaust gas purifying apparatus for internal combustion engines | |
| GB1299334A | Industrial waste gas purification system | |
| DE1292669B | Muffler for internal combustion engines, in particular for motor vehicles | |
| CA828552A | Exhaust gas purifier for automobile |