1. CPC Sections
  2. CPC Section F
  3. CPC Class F02
  4. CPC Subclass F02G
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Version: 2024.08
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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 [2021-01]
NOTE

  • Attention is drawn to the notes preceding class F01.
F02G 1/00
Hot gas positive-displacement engine plants [2021-01]
F02G 1/02
.
of open-cycle type [2013-01]
F02G 1/04
.
of closed-cycle type [2013-01]
F02G 1/043
. .
the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines [2017-08]
F02G 1/0435
. . .
{the engine being of the free piston type} [2013-01]
F02G 1/044
. . .
having at least two working members, e.g. pistons, delivering power output [2013-01]
F02G 1/0445
. . . .
{Engine plants with combined cycles, e.g. Vuilleumier} [2013-01]
F02G 1/045
. . .
Controlling [2013-01]
F02G 1/047
. . . .
by varying the heating or cooling [2013-01]
F02G 1/05
. . . .
by varying the rate of flow or quantity of the working gas [2013-01]
F02G 1/053
. . .
Component parts or details [2013-01]
F02G 1/0535
. . . .
{Seals or sealing arrangements} [2013-01]
F02G 1/055
. . . .
Heaters or coolers [2013-01]
F02G 1/057
. . . .
Regenerators [2013-01]
F02G 1/06
.
Controlling [2013-01]
F02G 3/00
Combustion-product positive-displacement engine plants [2021-01]
F02G 3/02
.
with reciprocating-piston engines [2013-01]
F02G 5/00
Profiting from waste heat of combustion engines, not otherwise provided for [2013-01]
F02G 5/02
.
Profiting from waste heat of exhaust gases [2013-01]
F02G 5/04
. .
in combination with other waste heat from combustion engines [2013-01]
F02G 2242/00
Ericsson-type engines having open regenerative cycles controlled by valves [2013-01]
F02G 2242/02
.
Displacer-type engines [2013-01]
F02G 2242/04
. .
having constant working volume [2013-01]
F02G 2242/06
. . .
with external drive displacers [2013-01]
F02G 2242/08
. . . .
having gas actuated valves, e.g. "Bush engines" [2013-01]
F02G 2242/10
. . . .
having mechanically actuated valves, e.g. "Gifford" or "McMahon engines" [2013-01]
F02G 2242/30
. .
having variable working volume [2013-01]
F02G 2242/32
. . .
Regenerative displacers with independent pistons [2013-01]
F02G 2242/40
.
Piston-type engines [2013-01]
F02G 2242/42
. .
having a single piston regenerative displacer attached to the piston, e.g. "Gifford-McMahon" engines [2013-01]
F02G 2242/44
. .
having two pistons and reverse flow regenerators [2013-01]
F02G 2243/00
Stirling type engines having closed regenerative thermodynamic cycles with flow controlled by volume changes [2013-01]
F02G 2243/02
.
having pistons and displacers in the same cylinder [2013-01]
F02G 2243/04
. .
Crank-connecting-rod drives [2013-01]
F02G 2243/06
. . .
Regenerative displacers [2013-01]
F02G 2243/08
. . .
External regenerators, e.g. "Rankine Napier" engines [2013-01]
F02G 2243/20
. .
each having a single free piston, e.g. "Beale engines" [2013-01]
F02G 2243/202
. . .
resonant [2013-01]
F02G 2243/204
. . .
non-resonant [2013-01]
F02G 2243/206
. . .
externally excited [2013-01]
F02G 2243/22
. .
with oscillating cylinders [2013-01]
F02G 2243/24
. .
with free displacers [2013-01]
F02G 2243/30
.
having their pistons and displacers each in separate cylinders [2024-08]
F02G 2243/32
. .
Regenerative displacers having parallel cylinder, e.g. "Lauberau" or "Schwartzkopff" engines [2013-01]
F02G 2243/34
. .
Regenerative displacers having their cylinders at right angle, e.g. "Robinson" engines [2013-01]
F02G 2243/36
. .
with twin-expansion cylinders, e.g. "Rainbow" engines [2013-01]
F02G 2243/38
. .
External regenerators having parallel cylinders, e.g. "Heinrici" engines [2013-01]
F02G 2243/40
. .
with free displacers [2013-01]
F02G 2243/50
. .
having resonance tubes [2013-01]
F02G 2243/52
. . .
acoustic [2013-01]
F02G 2243/54
. . .
thermo-acoustic [2013-01]
F02G 2244/00
Machines having two pistons [2013-01]
F02G 2244/02
.
Single-acting two piston engines [2013-01]
F02G 2244/04
. .
of rotary cylinder type, e.g. "Finkelstein" engines [2013-01]
F02G 2244/06
. .
of stationary cylinder type [2013-01]
F02G 2244/08
. . .
having parallel cylinder, e.g. "Rider" engines [2013-01]
F02G 2244/10
. . .
having cylinders in V-arrangement [2013-01]
F02G 2244/12
. . .
having opposed pistons [2013-01]
F02G 2244/50
.
Double acting piston machines [2013-01]
F02G 2244/52
. .
having interconnecting adjacent cylinders constituting a single system, e.g. "Rinia" engines [2013-01]
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 [2013-01]
F02G 2250/00
Special cycles or special engines [2013-01]
F02G 2250/03
.
Brayton cycles [2013-01]
F02G 2250/06
.
Beau de Rochas constant volume cycles [2013-01]
F02G 2250/09
.
Carnot cycles in general [2013-01]
F02G 2250/12
.
Malone liquid thermal cycles [2013-01]
F02G 2250/15
.
Sabathe mixed air cycles [2013-01]
F02G 2250/18
.
Vuilleumier cycles [2013-01]
F02G 2250/21
.
Cooke Yarborough engines [2013-01]
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 [2013-01]
F02G 2250/27
.
Martini Stirling engines [2013-01]
F02G 2250/31
.
Nano- or microengines [2017-08]
F02G 2253/00
Seals [2013-01]
F02G 2253/01
.
Rotary piston seals [2013-01]
F02G 2253/02
.
Reciprocating piston seals [2013-01]
F02G 2253/03
.
Stem seals [2013-01]
F02G 2253/04
.
Displacer seals [2013-01]
F02G 2253/06
.
Bellow seals [2013-01]
F02G 2253/08
.
Stem with rolling membranes [2013-01]
F02G 2253/10
.
Piston with rolling membranes [2013-01]
F02G 2253/50
.
Liquid seals [2013-01]
F02G 2253/60
.
Sealing of the lubrication circuit [2013-01]
F02G 2253/80
.
Sealing of the crankcase [2013-01]
F02G 2254/00
Heat inputs [2013-01]
F02G 2254/05
.
by air [2013-01]
F02G 2254/10
.
by burners [2013-01]
F02G 2254/11
. .
Catalytic burners [2013-01]
F02G 2254/12
.
by ejectors [2013-01]
F02G 2254/15
.
by exhaust gas [2013-01]
F02G 2254/18
.
using deflectors, e.g. spirals [2013-01]
F02G 2254/20
.
using heat transfer tubes [2013-01]
F02G 2254/30
.
using solar radiation [2013-01]
F02G 2254/40
.
using heat accumulators [2013-01]
F02G 2254/45
.
by electric heating [2013-01]
F02G 2254/50
.
Dome arrangements for heat input [2013-01]
F02G 2254/60
.
using air preheaters [2013-01]
F02G 2254/70
.
by catalytic conversion, i.e. flameless oxydation [2013-01]
F02G 2254/90
.
by radioactivity [2013-01]
F02G 2255/00
Heater tubes [2013-01]
F02G 2255/10
.
dome shaped [2013-01]
F02G 2255/20
.
Heater fins [2013-01]
F02G 2256/00
Coolers [2013-01]
F02G 2256/02
.
Cooler fins [2013-01]
F02G 2256/04
.
Cooler tubes [2013-01]
F02G 2256/50
.
with coolant circulation [2013-01]
F02G 2257/00
Regenerators [2013-01]
F02G 2257/02
.
rotating [2013-01]
F02G 2258/00
Materials used [2013-01]
F02G 2258/10
.
ceramic [2013-01]
F02G 2258/20
.
having heat insulating properties [2013-01]
F02G 2258/50
.
having frictional properties [2013-01]
F02G 2258/80
.
having magnetic properties [2013-01]
F02G 2258/90
.
Processing of materials [2013-01]
F02G 2260/00
Recuperating heat from exhaust gases of combustion engines and heat from cooling circuits [2013-01]
F02G 2262/00
Recuperating heat from exhaust gases of combustion engines and heat from lubrication circuits [2013-01]
F02G 2270/00
Constructional features [2013-01]
F02G 2270/005
.
Shells, e.g. a sealed or sealing shell for a Stirling engine [2013-01]
F02G 2270/02
.
Pistons for reciprocating and rotating [2013-01]
F02G 2270/04
.
Roller assemblies connecting opposed pistons [2013-01]
F02G 2270/10
.
Rotary pistons [2013-01]
F02G 2270/15
.
Rotating cylinders [2013-01]
F02G 2270/20
.
Plural piston swash plates [2013-01]
F02G 2270/30
.
Displacer assemblies [2013-01]
F02G 2270/40
.
Piston assemblies [2013-01]
F02G 2270/42
.
Displacer drives [2013-01]
F02G 2270/425
. .
the displacer being driven by a four-bar mechanism, e.g. a rhombic mechanism [2013-01]
F02G 2270/45
.
Piston rods [2013-01]
F02G 2270/50
.
Crosshead guiding pistons [2013-01]
F02G 2270/55
.
Cylinders [2013-01]
F02G 2270/60
.
Counterweights for pistons [2013-01]
F02G 2270/70
.
Liquid pistons [2013-01]
F02G 2270/80
.
Engines without crankshafts [2013-01]
F02G 2270/85
.
Crankshafts [2013-01]
F02G 2270/90
.
Valves [2013-01]
F02G 2270/95
.
Pressurised crankcases [2013-01]
F02G 2275/00
Controls [2013-01]
F02G 2275/10
.
for vibration reduction [2013-01]
F02G 2275/20
.
for preventing piston over stroke [2013-01]
F02G 2275/30
.
for proper burning [2013-01]
F02G 2275/40
.
for starting [2013-01]
F02G 2280/00
Output delivery [2013-01]
F02G 2280/005
.
Medical applications, e.g. for prosthesis or artificial hearts [2013-01]
F02G 2280/10
.
Linear generators [2013-01]
F02G 2280/20
.
Rotary generators [2013-01]
F02G 2280/50
.
Compressors or pumps [2013-01]
F02G 2280/60
.
Heat pumps [2013-01]
F02G 2280/70
.
Clutches [2013-01]
F02G 2290/00
Engines characterised by the use of a particular power transfer medium, e.g. Helium [2013-01]