| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 7 | |
| #2 | United States | 4 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Machines | |
| #3 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Rotary-pistons | |
| #2 | Rotary pistons | |
| #3 | Positive-displacement engines | |
| #4 | Venting or aerating devices | |
| #5 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Davis Walwin L | 11 |
| Publication | Filing date | Title |
|---|---|---|
| US2272635A | Balanced rotary pump | |
| US2293119A | Rotary pump | |
| US2299079A | Relief valve | |
| US2260888A | Pump | |
| CA408453A | Airplane instrument | |
| CA403736A | Rotary pump | |
| CA418250A | Rotary pump | |
| CA405215A | Relief valve for fuel pumps | |
| CA403735A | Fuel supply system | |
| CA403734A | Pump | |
| CA413609A | Oil condenser for air compressors |