| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Switzerland | 2 | |
| #2 | Germany | 2 | |
| #3 | United Kingdom | 2 | |
| #4 | Netherlands | 2 | |
| #5 | Sweden | 2 | |
| #6 | United States | 2 | |
| #7 | Belgium | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Venting or aerating devices | |
| #2 | Pipes | |
| #3 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Pierre Perolo | 3 |
| #2 | Perolo P | 2 |
| #3 | Perolo Pierre | 2 |
| Publication | Filing date | Title |
|---|---|---|
| DE1550212A1 | Shut-off device with coupled shut-off devices for installation in pipes under overpressure | |
| DE1475666A1 | Pipeline coupling provided with an opening and closing device |