| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 7 | |
| #2 | United States | 3 | |
| #3 | United Kingdom | 2 |
| # | Industry | |
|---|---|---|
| #1 | Transport | |
| #2 | Mechanical elements | |
| #3 | Machines | |
| #4 | Control | |
| #5 | Engines, pumps and turbines | |
| #6 | Thermal processes |
| # | Technology | |
|---|---|---|
| #1 | Vehicle brake control systems | |
| #2 | Venting or aerating devices | |
| #3 | Unspecified technologies | |
| #4 | Systems controlling non-electric variables | |
| #5 | Steam generation | |
| #6 | Pumps |
| # | Name | Total Patents |
|---|---|---|
| #1 | Ackermann Gottlieb | 3 |
| #2 | Gottlieb Ackermann | 3 |
| Publication | Filing date | Title |
|---|---|---|
| US1972435A | Safety valve | |
| US1952646A | Safety valve | |
| GB359654A | Improvements in or relating to safety valves | |
| US1794270A | Pressure regulator and safety valve | |
| GB261968A | An improved stop-cock |