| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United Kingdom | 5 | |
| #2 | United States | 5 | |
| #3 | France | 2 | |
| #4 | Belgium | 1 | |
| #5 | Germany | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Venting or aerating devices | |
| #2 | Pistons and sealings | |
| #3 | Unspecified technologies | |
| #4 | Pipes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Willis Harold Victor | 3 |
| #2 | Swain Frank Edward | 2 |
| #3 | Victor Willis Harold | 2 |
| #4 | Swain F E | 2 |
| #5 | Edward Swain Frank | 2 |
| #6 | Swain Frank E | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB1135811A | Improvements in butterfly valves | |
| US3317179A | Valve operating linkages | |
| US3291444A | Butterfly valves | |
| GB1062662A | Improvements relating to valves | |
| DE1082782B | throttle | |
| US3080145A | Butterfly valves | |
| US3030066A | Butterfly valves | |
| US3027909A | Fluid control valves | |
| GB843845A | Improvements relating to butterfly valves | |
| GB753517A | An improved valve | |
| GB700789A | Improvements connected with rotary valves |