| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 12 | |
| #2 | United Kingdom | 3 | |
| #3 | United States | 3 |
| # | Industry | |
|---|---|---|
| #1 | Environmental technology | |
| #2 | Engines, pumps and turbines | |
| #3 | Electrical machinery and energy | |
| #4 | Machines | |
| #5 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Gas-flow silencers for machines | |
| #2 | Supplying combustion engines | |
| #3 | Pipes | |
| #4 | Shaping clay | |
| #5 | Electrically-conductive connections |
| # | Name | Total Patents |
|---|---|---|
| #1 | Ernst Josef | 7 |
| #2 | Josef Ernst | 2 |
| #3 | Johannes Ernst | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US3290876A | Engine exhaust gas decontaminating device | |
| US2937707A | Muffler for silencing gases | |
| GB505157A | Silencer for internal combustion engines | |
| GB402670A | Improvements in exhaust silencers for internal-combustion engines | |
| US1646283A | Exhaust silencer | |
| GB234395A | Improvements in and relating to exhaust silencers |