| # | Country | Total Patents | |
|---|---|---|---|
| #1 | EPO (European Patent Office) | 7 | |
| #2 | WIPO (World Intellectual Property Organization) | 7 | |
| #3 | China | 4 | |
| #4 | United Kingdom | 4 | |
| #5 | Republic of Korea | 4 | |
| #6 | Mexico | 4 | |
| #7 | Brazil | 3 | |
| #8 | Taiwan | 3 | |
| #9 | United States | 3 | |
| #10 | Canada | 2 | |
| #11 | Hong Kong | 2 | |
| #12 | Argentina | 1 | |
| #13 | Australia | 1 | |
| #14 | Hungary | 1 | |
| #15 | New Zealand | 1 | |
| #16 | Russian Federation | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Mechanical elements | |
| #3 | Machines | |
| #4 | Measurement | |
| #5 | Chemical engineering |
| # | Technology | |
|---|---|---|
| #1 | Domestic plumbing installations | |
| #2 | Venting or aerating devices | |
| #3 | Unspecified technologies | |
| #4 | Pipes | |
| #5 | Unspecified technologies | |
| #6 | Separation | |
| #7 | Testing of structures | |
| #8 | Installations for obtaining water |
| # | Name | Total Patents |
|---|---|---|
| #1 | Ericson Kurt Sture Birger | 23 |
| #2 | Low Han Sin | 14 |
| #3 | Campbell David | 8 |
| #4 | Swaffield John | 7 |
| #5 | Trueb Thomas W | 6 |
| #6 | Leong Kam Yoon | 4 |
| #7 | Campbell David Paul | 3 |
| #8 | Birger Ericson Kurt Sture | 3 |
| #9 | Swaffield John A | 2 |
| #10 | Gormley Michael | 2 |
| Publication | Filing date | Title |
|---|---|---|
| TW201028575A | Air admittance valve | |
| EP2241686A1 | High capacity air admittance valve for sanitary waste pipe system | |
| EP2224066A1 | Air admittance valve | |
| GB0618206D0 | Method and equipment for detecting sealing deficiencies in drainage and vent systems for buildings | |
| US2006201088A1 | Sealed off building drainage and vent system | |
| GB0428401D0 | Water trap for sanitary appliances | |
| GB0408298D0 | Odour absorbing ventilation device for waste | |
| GB0121561D0 | Pressure relief device in drainage systems |