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| Number | Title | Issue Date |
| 7721679 | Vapor generator with preheater and method of operating same An efficient high-temperature water vapor generator includes a combustion chamber and a surrounding structure, wherein a cavity is located therebetween. Water is pumped into the cavity at a location near a first end of the combustion chamber. Water is removed from t... | 05/25/2010 |
| 7293532 | Heavy oil extraction system An efficient high-temperature water vapor generator is used to heat heavy oil located in an underground cavity, thereby reducing the viscosity of the oil and enabling the oil to be pumped to the surface. The vapor generator includes a combustion chamber and a surrou... | 11/13/2007 |
| 7228822 | Vapor generator using pre-heated injected water An efficient high-temperature water vapor generator is used to de-contaminate soil. The vapor generator includes a combustion chamber and a surrounding structure, wherein a cavity is located therebetween. Water is routed through the cavity and into the combustion ch... | 06/12/2007 |
| 5425415 | Vertical heat exchanger A vertical heat exchanger including a vertical tube bundle connected between a lower inlet manifold and upper outlet manifold. The tube bundle comprises numerous pairs of concentric tubes with the inner tube being spaced from the outer tube to form an ann... | 06/20/1995 |
| 4171685 | Hot water or steam boiler Hot water or steam boiler comprising a furnace section and a convection section in which the furnace section is limited by a wall section formed of liquid or steam tubes placed side by side, said tubes being arranged transversal to the flue gas flow and a... | 10/23/1979 |
