| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 12 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Non-positive-displacement pumps | |
| #2 | Rotary-pistons | |
| #3 | Pumps | |
| #4 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Derrick William I | 6 |
| #2 | Holmes Robert E L | 4 |
| #3 | Claypool Wallace L | 2 |
| Publication | Filing date | Title |
|---|---|---|
| US1909756A | Rotary pump | |
| US1865396A | Rotary pump | |
| US1760402A | Pump | |
| US1665688A | Pump | |
| US1665689A | Pump | |
| US1682756A | Rotary-pump casing | |
| US1635846A | Pump | |
| US1651330A | Pump-operating mechanism | |
| US1635786A | Pump | |
| US1665687A | Pump | |
| US1560044A | Liquid-supply system | |
| US1611004A | Rotary pump |