| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Australia | 2 | |
| #2 | United States | 2 | |
| #3 | Canada | 1 | |
| #4 | EPO (European Patent Office) | 1 | |
| #5 | India | 1 | |
| #6 | New Zealand | 1 | |
| #7 | Portugal | 1 | |
| #8 | WIPO (World Intellectual Property Organization) | 1 | |
| #9 | South Africa | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Venting or aerating devices | |
| #2 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Furness John | 4 |
| #2 | Thurston David Frederick | 4 |
| #3 | Thurston V | 3 |
| #4 | Marshall G | 3 |
| #5 | Marshall Geoffrey B | 2 |
| #6 | Thurston Victor N | 2 |
| #7 | Marshall Geoffrey Bernard | 1 |
| #8 | Thurston Victor Noel | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US6149130A | Butterfly valves | |
| US4265426A | Butterfly valve | |
| NZ191435A | Butterfly valve asymmetric disc |