| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 10 | |
| #2 | Canada | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Machines | |
| #3 | Mechanical elements | |
| #4 | Environmental technology | |
| #5 | Civil engineering | |
| #6 | Thermal processes |
| # | Technology | |
|---|---|---|
| #1 | Venting or aerating devices | |
| #2 | Unspecified technologies | |
| #3 | Reduction of greenhouse gas emissions | |
| #4 | Machines for liquids | |
| #5 | Unspecified technologies | |
| #6 | Doors and windows | |
| #7 | Steam turbines | |
| #8 | Heat-exchanger without contact | |
| #9 | Dredging | |
| #10 | Servomotors |
| # | Name | Total Patents |
|---|---|---|
| #1 | Walker Thomas H | 11 |
| Publication | Filing date | Title |
|---|---|---|
| US1792946A | Turbine engine | |
| US1754659A | Casement-sash hinge | |
| US1346285A | Current-motor | |
| US1034940A | Current-motor. | |
| US981231A | Steam or hot-water radiator. | |
| US916232A | Excavator. | |
| US982400A | Automatic valve. | |
| CA109392A | Automatically closing valve | |
| US881270A | Sheet-metal-radiator manufacture. | |
| US842279A | Automatically-closing valve. | |
| US881271A | Fire-protective system. |