| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 3 | |
| #2 | Austria | 2 | |
| #3 | France | 2 | |
| #4 | United Kingdom | 2 | |
| #5 | Belgium | 1 | |
| #6 | Switzerland | 1 | |
| #7 | Denmark | 1 | |
| #8 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Venting or aerating devices | |
| #2 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Nordstrand Sven-Gosta | 2 |
| #2 | Sven-Gosta Nordstrand | 2 |
| #3 | Stromberg Henry | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB837409A | Fluid control valves | |
| GB836597A | Improvements relating to fluid control valves | |
| US2928421A | Valves | |
| CA633574A | Valves | |
| CA642739A | Valve device | |
| CA623098A | Valves |