| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Australia | 6 | |
| #2 | WIPO (World Intellectual Property Organization) | 5 | |
| #3 | EPO (European Patent Office) | 4 | |
| #4 | Brazil | 2 | |
| #5 | Argentina | 1 | |
| #6 | Canada | 1 | |
| #7 | Czechia | 1 | |
| #8 | Denmark | 1 | |
| #9 | Hungary | 1 | |
| #10 | Republic of Korea | 1 | |
| #11 | Poland | 1 | |
| #12 | United States | 1 | |
| #13 | South Africa | 1 |
| # | Industry | |
|---|---|---|
| #1 | Environmental technology | |
| #2 | Engines, pumps and turbines | |
| #3 | Chemical engineering | |
| #4 | Transport |
| # | Name | Total Patents |
|---|---|---|
| #1 | Frederiksen Svend | 19 |
| #2 | Frederiksen Lars | 10 |
| #3 | Frederiksen Eyvind | 9 |
| #4 | Stobbe Per | 4 |
| #5 | Sorenson Spencer C | 4 |
| #6 | Bingham D W | 2 |
| #7 | Hoj Jakob Weiland | 2 |
| #8 | Schoubye Peter Carl Sehested | 2 |
| #9 | Frediricksen Larss | 1 |
| #10 | Hoej Jakob Weiland | 1 |
| Publication | Filing date | Title |
|---|---|---|
| AU4897299A | Diesel exhaust gas filter | |
| WO9950539A2 | A silencer and a method of operating a vehicle | |
| WO9935378A1 | A silencer | |
| ZA9708780B | A silencer | |
| WO9814693A1 | Gas flow silencer | |
| DK242590D0 | Method for filtering particles from exhaust gas, an exhaust gas filter and a vehicle |