| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 32 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Machines | |
| #3 | Electrical machinery and energy | |
| #4 | Chemical engineering | |
| #5 | Environmental technology | |
| #6 | Thermal processes | |
| #7 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Non-positive-displacement pumps | |
| #2 | Machines | |
| #3 | Unspecified technologies | |
| #4 | Rotary-pistons | |
| #5 | Water treatment | |
| #6 | Milling | |
| #7 | Electric switches | |
| #8 | Domestic heating systems | |
| #9 | Gearing | |
| #10 | Mixing |
| # | Name | Total Patents |
|---|---|---|
| #1 | Durdin Jr Augustus C | 32 |
| Publication | Filing date | Title |
|---|---|---|
| US2371681A | Centrifugal cutting pump | |
| US2315946A | Vacuum condensation pump | |
| US2342927A | Comminutor | |
| US2295391A | Sewage treatment apparatus | |
| US2320514A | Comminutor | |
| US2262576A | Digester | |
| US2308868A | Power transmission system | |
| US2258005A | Power transmission | |
| US2186371A | Apparatus for and method of removing supernatant matter from sewage and other liquids | |
| US1971775A | Vacuum condensation pump | |
| US1901154A | Vacuum condensation pump | |
| US1993832A | Steam heating system | |
| US1890318A | Vacuum condensation pump | |
| US1775425A | Vacuum condensation pump | |
| US1786056A | Pumping apparatus | |
| US1786055A | Vacuum condensation pump | |
| US1819774A | Automatic control for motors | |
| US1880911A | Seal for shaft bearings | |
| US1842081A | Shaft bearing for pumps | |
| US1811458A | Electric switch actuating mechanism |