| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 5 | |
| #2 | Denmark | 2 | |
| #3 | Norway | 2 | |
| #4 | WIPO (World Intellectual Property Organization) | 2 | |
| #5 | Brazil | 1 | |
| #6 | EPO (European Patent Office) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Thermal processes | |
| #2 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Production or use of heat | |
| #2 | Steam generation | |
| #3 | Machines for liquids | |
| #4 | Fluid heaters |
| # | Name | Total Patents |
|---|---|---|
| #1 | Perkins Eugene W | 13 |
| Publication | Filing date | Title |
|---|---|---|
| US4779575A | Liquid friction heating apparatus | |
| US4798176A | Apparatus for frictionally heating liquid | |
| EP0281556A1 | Heating system using a liquid heater as the source of heat. | |
| US4483277A | Superheated liquid heating system | |
| US4501231A | Heating system with liquid pre-heating | |
| US4651681A | Heating system using a liquid heater as the source of heat |