Power plants – Combustion products used as motive fluid – Combined with regulation of power output feature
Reexamination Certificate
2006-07-18
2006-07-18
Nguyen, Hoang (Department: 3748)
Power plants
Combustion products used as motive fluid
Combined with regulation of power output feature
C060S517000, C060S525000
Reexamination Certificate
active
07076941
ABSTRACT:
An externally heated engine is provided which has at least two pistons. The first piston has a first side (working side) and a second side opposite the first side. The first side of the first piston and the first cylinder define a first working chamber containing working fluid. The second side of the first piston and the first cylinder define a first opposite chamber containing an opposing fluid. A heater heats the working fluid in the first cylinder. Preferably, the cylinder is heated by a heat source so that the working fluid has a temperature of no more than 500° Fahrenheit with a temperature difference between the heat source and the working fluid of less than 5° Fahrenheit. The second piston reciprocates within a second cylinder, and has a first side (working side) and a second side opposite the first side. The first side and the cylinder define a working chamber containing working fluid. The second side of the piston and the cylinder define a second opposite chamber containing an opposing fluid. The working fluid in the second cylinder is cooled to a temperature of below 35° Fahrenheit.
REFERENCES:
patent: 3861146 (1975-01-01), Lynch et al.
patent: 3939657 (1976-02-01), Postma et al.
patent: 4722188 (1988-02-01), Otters
patent: 6945044 (2005-09-01), Gimsa
Hoffman Gary P.
Ide Richard J.
Nguyen Hoang
Renewable Thermodynamics LLC
Slifkin Neal L.
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