| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 12 | |
| #2 | Canada | 5 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Mechanical elements | |
| #3 | Control | |
| #4 | Engines, pumps and turbines | |
| #5 | Chemical engineering | |
| #6 | Furniture and games |
| # | Technology | |
|---|---|---|
| #1 | Unspecified technologies | |
| #2 | Systems controlling non-electric variables | |
| #3 | Venting or aerating devices | |
| #4 | Pumps | |
| #5 | Unspecified technologies | |
| #6 | Mechanical control devices | |
| #7 | Separation | |
| #8 | Domestic washing |
| # | Name | Total Patents |
|---|---|---|
| #1 | Birch William T | 17 |
| Publication | Filing date | Title |
|---|---|---|
| US2205463A | Relief valve | |
| US2197606A | Pump valve | |
| US2067229A | Relief valve | |
| US2011031A | Strainer for automobile cooling systems | |
| US1956787A | Regulator and relief valve | |
| US1956821A | Relief valve | |
| US1946188A | Regulator and release valve | |
| US1674849A | Pedal cover | |
| US1625187A | Foot pad | |
| US1564819A | Pump | |
| CA154228A | Pump valve | |
| US1090775A | Pump-valve. | |
| CA344484A | Relief valve | |
| US1140869A | Pump-valve. | |
| CA371042A | Water pressure regulator and valve | |
| CA344485A | Regulator and relief valve | |
| CA396876A | Relief valve |