United States Patent and Trademark Office

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Color		Curly Brackets (indicating CPC extensions to IPC)

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	CPC	COOPERATIVE PATENT CLASSIFICATION

F02G

HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS (steam engine plants, special vapour plants, plants operating on either hot gas or combustion-product gases together with other fluid F01K; gas-turbine plants F02C; jet-propulsion plants F02K); USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR

NOTE

Attention is drawn to the notes preceding class F01.

F02G 1/00

Hot gas positive-displacement engine plants (positive-displacement engine plants characterised by the working gas being generated by combustion in the plant F02G 3/00)

F02G 1/02

of open-cycle type

F02G 1/04

of closed-cycle type

F02G 1/043

. .

the engine being operated by expansion and contraction of a mass of working gas which is heated and colled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engine

F02G 1/0435

. . .

{

the engine being of the free piston type

}

F02G 1/044

. . .

having at least two working members, e.g. pistons, delivering power output

F02G 1/0445

. . . .

{

Engine plants with combined cycles, e.g. Vuilleumier

}

F02G 1/045

. . .

Controlling

F02G 1/047

. . . .

by varying the heating or cooling

F02G 1/05

. . . .

by varying the rate of flow or quantity of the working gas

F02G 1/053

. . .

Component parts or details

F02G 1/0535

. . . .

{

Seals or sealing arrangements

}

F02G 1/055

. . . .

Heaters or coolers

F02G 1/057

. . . .

Regenerators

F02G 1/06

Controlling

F02G 3/00

Positive-displacement engine plants characterised by the working gas being generated by combustion in the plant

F02G 3/02

with reciprocating-piston engines

F02G 5/00

Profiting from waste heat of combustion engines, not otherwise provided for

F02G 5/02

Profiting from waste heat of exhaust gases

F02G 5/04

. .

in combination with other waste heat from combustion engines

F02G 2242/00

Ericsson-type engines having open regenerative cycles controlled by valves

F02G 2242/02

Displacer-type engines

F02G 2242/04

. .

having constant working volume

F02G 2242/06

. . .

with external drive displacers

F02G 2242/08

. . . .

having gas actuated valves, e.g. "Bush engines"

F02G 2242/10

. . . .

having mechanically actuated valves, e.g. "Gifford" or "McMahon engines"

F02G 2242/30

. .

having variable working volume

F02G 2242/32

. . .

Regenerative displacers with independent pistons

F02G 2242/40

Piston-type engines

F02G 2242/42

. .

having a single piston regenerative displacer attached to the piston, e.g. "Gifford-McMahon" engines

F02G 2242/44

. .

having two pistons and reverse flow regenerators

F02G 2243/00

Stirling type engines having closed regenerative thermodynamic cycles with flow controlled by volume changes

F02G 2243/02

having pistons and displacers in the same cylinder

F02G 2243/04

. .

Crank-connecting-rod drives

F02G 2243/06

. . .

Regenerative displacers

F02G 2243/08

. . .

External regenerators, e.g. "Rankine Napier" engines

F02G 2243/20

. .

each having a single free piston, e.g. "Beale engines"

F02G 2243/202

. . .

resonant

F02G 2243/204

. . .

non-resonant

F02G 2243/206

. . .

externally excited

F02G 2243/22

. .

with oscillating cylinders

F02G 2243/24

. .

with free displacers

F02G 2243/30

having their pistons and displacers each in separate cylinders (two-piston machines F02G 2244/00)

F02G 2243/32

. .

Regenerative displacers having parallel cylinder, e.g. "Lauberau" or "Schwartzkopff" engines

F02G 2243/34

. .

Regenerative displacers having their cylinders at right angle, e.g. "Robinson" engines

F02G 2243/36

. .

with twin-expansion cylinders, e.g. "Rainbow" engines

F02G 2243/38

. .

External regenerators having parallel cylinders, e.g. "Heinrici" engines

F02G 2243/40

. .

with free displacers

F02G 2243/50

. .

having resonance tubes

F02G 2243/52

. . .

acoustic

F02G 2243/54

. . .

thermo-acoustic

F02G 2244/00

Machines having two pistons

F02G 2244/02

Single-acting two piston engines

F02G 2244/04

. .

of rotary cylinder type, e.g. "Finkelstein" engines

F02G 2244/06

. .

of stationary cylinder type

F02G 2244/08

. . .

having parallel cylinder, e.g. "Rider" engines

F02G 2244/10

. . .

having cylinders in V-arrangement

F02G 2244/12

. . .

having opposed pistons

F02G 2244/50

Double acting piston machines

F02G 2244/52

. .

having interconnecting adjacent cylinders constituting a single system, e.g. "Rinia" engines

F02G 2244/54

. .

having two-cylinder twin systems, with compression in one cylinder and expansion in the other cylinder for each of the twin systems, e.g. "Finkelstein" engines

F02G 2250/00

Special cycles or special engines

F02G 2250/03

Brayton cycles

F02G 2250/06

Beau de Rochas constant volume cycles

F02G 2250/09

Carnot cycles in general

F02G 2250/12

Malone liquid thermal cycles

F02G 2250/15

Sabathe mixed air cycles

F02G 2250/18

Vuilleumier cycles

F02G 2250/21

Cooke Yarborough engines

F02G 2250/24

Ringbom engines, the displacement of the free displacer being obtained by expansion of the heated gas and the weight of the piston

F02G 2250/27

Martini Stirling engines

F02G 2250/31

Nano or micro engines

F02G 2253/00

Seals

F02G 2253/01

Rotary piston seals

F02G 2253/02

Reciprocating piston seals

F02G 2253/03

Stem seals

F02G 2253/04

Displacer seals

F02G 2253/06

Bellow seals

F02G 2253/08

Stem with rolling membranes

F02G 2253/10

Piston with rolling membranes

F02G 2253/50

Liquid seals

F02G 2253/60

Sealing of the lubrication circuit

F02G 2253/80

Sealing of the crankcase

F02G 2254/00

Heat inputs

F02G 2254/05

by air

F02G 2254/10

by burners

F02G 2254/11

. .

Catalytic burners

F02G 2254/12

by ejectors

F02G 2254/15

by exhaust gas

F02G 2254/18

using deflectors, e.g. spirals

F02G 2254/20

using heat transfer tubes

F02G 2254/30

using solar radiation

F02G 2254/40

using heat accumulators

F02G 2254/45

by electric heating

F02G 2254/50

Dome arrangements for heat input

F02G 2254/60

using air preheaters

F02G 2254/70

by catalytic conversion, i.e. flameless oxydation

F02G 2254/90

by radioactivity

F02G 2255/00

Heater tubes

F02G 2255/10

dome shaped

F02G 2255/20

Heater fins

F02G 2256/00

Coolers

F02G 2256/02

Cooler fins

F02G 2256/04

Cooler tubes

F02G 2256/50

with coolant circulation

F02G 2257/00

Regenerators

F02G 2257/02

rotating

F02G 2258/00

Materials used

F02G 2258/10

ceramic

F02G 2258/20

having heat insulating properties

F02G 2258/50

having frictional properties

F02G 2258/80

having magnetic properties

F02G 2258/90

Processing of materials

F02G 2260/00

Recuperating heat from exhaust gases of combustion engines and heat from cooling circuits

F02G 2262/00

Recuperating heat from exhaust gases of combustion engines and heat from lubrication circuits

F02G 2270/00

Constructional features

F02G 2270/005

Shells, e.g. a sealed or sealing shell for a Stirling engine

F02G 2270/02

Pistons for reciprocating and rotating

F02G 2270/04

Roller assemblies connecting opposed pistons

F02G 2270/10

Rotary pistons

F02G 2270/15

Rotating cylinders

F02G 2270/20

Plural piston swash plates

F02G 2270/30

Displacer assemblies

F02G 2270/40

Piston assemblies

F02G 2270/42

Displacer drives

F02G 2270/425

. .

the displacer being driven by a four-bar mechanism, e.g. a rhombic mechanism

F02G 2270/45

Piston rods

F02G 2270/50

Crosshead guiding pistons

F02G 2270/55

Cylinders

F02G 2270/60

Counterweights for pistons

F02G 2270/70

Liquid pistons

F02G 2270/80

Engines without crankshafts

F02G 2270/85

Crankshafts

F02G 2270/90

Valves

F02G 2270/95

Pressurised crankcases

F02G 2275/00

Controls

F02G 2275/10

for vibration reduction

F02G 2275/20

for preventing piston over stroke

F02G 2275/30

for proper burning

F02G 2275/40

for starting

F02G 2280/00

Output delivery

F02G 2280/005

Medical applications, e.g. for prosthesis or artificial hearts

F02G 2280/10

Linear generators

F02G 2280/20

Rotary generators

F02G 2280/50

Compressors or pumps

F02G 2280/60

Heat pumps

F02G 2280/70

Clutches

F02G 2290/00

Engines characterised by the use of a particular power transfer medium, e.g. Helium