F02G1/00	7	Hot gas positive-displacement engine plants	F02G1/00	F02G1/00		182
F02G1/02	8	of open-cycle type	F02G1/02	F02G1/02		431
F02G1/04	8	of closed-cycle type	F02G1/04	F02G1/04		488
F02G1/043	9	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	F02G1/043	F02G1/043		2339
F02G1/0435	10	{the engine being of the free piston type}	F02G1/043	F02G1/043		765
F02G1/044	10	having at least two working members, e.g. pistons, delivering power output	F02G1/044	F02G1/044		755
F02G1/0445	11	{Engine plants with combined cycles, e.g. Vuilleumier}	F02G1/044	F02G1/044		241
F02G1/045	10	Controlling	F02G1/045	F02G1/045		267
F02G1/047	11	by varying the heating or cooling	F02G1/047	F02G1/047		147
F02G1/05	11	by varying the rate of flow or quantity of the working gas	F02G1/05	F02G1/05		293
F02G1/053	10	Component parts or details	F02G1/053	F02G1/053		813
F02G1/0535	11	{Seals or sealing arrangements}	F02G1/053	F02G1/053		427
F02G1/055	11	Heaters or coolers	F02G1/055	F02G1/055		1212
F02G1/057	11	Regenerators	F02G1/057	F02G1/057		593
F02G1/06	8	Controlling	F02G1/06	F02G1/06		103
F02G3/00	7	Combustion-product positive-displacement engine plants	F02G3/00	F02G3/00		404
F02G3/02	8	with reciprocating-piston engines	F02G3/02	F02G3/02		384
F02G5/00	7	Profiting from waste heat of combustion engines, not otherwise provided for	F02G5/00	F02G5/00		1276
F02G5/02	8	Profiting from waste heat of exhaust gases	F02G5/02	F02G5/02		3031
F02G5/04	9	in combination with other waste heat from combustion engines	F02G5/04	F02G5/04		1020
F02G2242/00	7	Ericsson-type engines having open regenerative cycles controlled by valves	CPCONLY	F02G2242/00		37
F02G2242/02	8	Displacer-type engines	CPCONLY	F02G2242/02		10
F02G2242/04	9	having constant working volume	CPCONLY	F02G2242/04		2
F02G2242/06	10	with external drive displacers	CPCONLY	F02G2242/06		1
F02G2242/08	11	having gas actuated valves, e.g. "Bush engines"	CPCONLY	F02G2242/08		
F02G2242/10	11	having mechanically actuated valves, e.g. "Gifford" or "McMahon engines"	CPCONLY	F02G2242/10		5
F02G2242/30	9	having variable working volume	CPCONLY	F02G2242/30		5
F02G2242/32	10	Regenerative displacers with independent pistons	CPCONLY	F02G2242/32		6
F02G2242/40	8	Piston-type engines	CPCONLY	F02G2242/40		14
F02G2242/42	9	having a single piston regenerative displacer attached to the piston, e.g. "Gifford-McMahon" engines	CPCONLY	F02G2242/42		15
F02G2242/44	9	having two pistons and reverse flow regenerators	CPCONLY	F02G2242/44		9
F02G2243/00	7	Stirling type engines having closed regenerative thermodynamic cycles with flow controlled by volume changes	CPCONLY	F02G2243/00		554
F02G2243/02	8	having pistons and displacers in the same cylinder	CPCONLY	F02G2243/02		290
F02G2243/04	9	Crank-connecting-rod drives	CPCONLY	F02G2243/04		148
F02G2243/06	10	Regenerative displacers	CPCONLY	F02G2243/06		25
F02G2243/08	10	External regenerators, e.g. "Rankine Napier" engines	CPCONLY	F02G2243/08		128
F02G2243/20	9	each having a single free piston, e.g. "Beale engines"	CPCONLY	F02G2243/20		11
F02G2243/202	10	resonant	CPCONLY	F02G2243/202		8
F02G2243/204	10	non-resonant	CPCONLY	F02G2243/204		
F02G2243/206	10	externally excited	CPCONLY	F02G2243/206		2
F02G2243/22	9	with oscillating cylinders	CPCONLY	F02G2243/22		7
F02G2243/24	9	with free displacers	CPCONLY	F02G2243/24		49
F02G2243/30	8	having their pistons and displacers each in separate cylinders	CPCONLY	F02G2243/30		147
F02G2243/32	9	Regenerative displacers having parallel cylinder, e.g. "Lauberau" or "Schwartzkopff" engines	CPCONLY	F02G2243/32		23
F02G2243/34	9	Regenerative displacers having their cylinders at right angle, e.g. "Robinson" engines	CPCONLY	F02G2243/34		82
F02G2243/36	9	with twin-expansion cylinders, e.g. "Rainbow" engines	CPCONLY	F02G2243/36		4
F02G2243/38	9	External regenerators having parallel cylinders, e.g. "Heinrici" engines	CPCONLY	F02G2243/38		25
F02G2243/40	9	with free displacers	CPCONLY	F02G2243/40		10
F02G2243/50	9	having resonance tubes	CPCONLY	F02G2243/50		9
F02G2243/52	10	acoustic	CPCONLY	F02G2243/52		98
F02G2243/54	10	thermo-acoustic	CPCONLY	F02G2243/54		172
F02G2244/00	7	Machines having two pistons	CPCONLY	F02G2244/00		233
F02G2244/02	8	Single-acting two piston engines	CPCONLY	F02G2244/02		56
F02G2244/04	9	of rotary cylinder type, e.g. "Finkelstein" engines	CPCONLY	F02G2244/04		14
F02G2244/06	9	of stationary cylinder type	CPCONLY	F02G2244/06		8
F02G2244/08	10	having parallel cylinder, e.g. "Rider" engines	CPCONLY	F02G2244/08		48
F02G2244/10	10	having cylinders in V-arrangement	CPCONLY	F02G2244/10		41
F02G2244/12	10	having opposed pistons	CPCONLY	F02G2244/12		36
F02G2244/50	8	Double acting piston machines	CPCONLY	F02G2244/50		384
F02G2244/52	9	having interconnecting adjacent cylinders constituting a single system, e.g. "Rinia" engines	CPCONLY	F02G2244/52		87
F02G2244/54	9	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	CPCONLY	F02G2244/54		37
F02G2250/00	7	Special cycles or special engines	CPCONLY	F02G2250/00		11
F02G2250/03	8	Brayton cycles	CPCONLY	F02G2250/03		173
F02G2250/06	8	Beau de Rochas constant volume cycles	CPCONLY	F02G2250/06		10
F02G2250/09	8	Carnot cycles in general	CPCONLY	F02G2250/09		29
F02G2250/12	8	Malone liquid thermal cycles	CPCONLY	F02G2250/12		8
F02G2250/15	8	Sabathe mixed air cycles	CPCONLY	F02G2250/15		1
F02G2250/18	8	Vuilleumier cycles	CPCONLY	F02G2250/18		176
F02G2250/21	8	Cooke Yarborough engines	CPCONLY	F02G2250/21		3
F02G2250/24	8	Ringbom engines, the displacement of the free displacer being obtained by expansion of the heated gas and the weight of the piston	CPCONLY	F02G2250/24		9
F02G2250/27	8	Martini Stirling engines	CPCONLY	F02G2250/27		22
F02G2250/31	8	Nano- or microengines	CPCONLY	F02G2250/31		14
F02G2253/00	7	Seals	CPCONLY	F02G2253/00		56
F02G2253/01	8	Rotary piston seals	CPCONLY	F02G2253/01		9
F02G2253/02	8	Reciprocating piston seals	CPCONLY	F02G2253/02		137
F02G2253/03	8	Stem seals	CPCONLY	F02G2253/03		126
F02G2253/04	8	Displacer seals	CPCONLY	F02G2253/04		22
F02G2253/06	8	Bellow seals	CPCONLY	F02G2253/06		39
F02G2253/08	8	Stem with rolling membranes	CPCONLY	F02G2253/08		45
F02G2253/10	8	Piston with rolling membranes	CPCONLY	F02G2253/10		29
F02G2253/50	8	Liquid seals	CPCONLY	F02G2253/50		31
F02G2253/60	8	Sealing of the lubrication circuit	CPCONLY	F02G2253/60		19
F02G2253/80	8	Sealing of the crankcase	CPCONLY	F02G2253/80		26
F02G2254/00	7	Heat inputs	CPCONLY	F02G2254/00		60
F02G2254/05	8	by air	CPCONLY	F02G2254/05		7
F02G2254/10	8	by burners	CPCONLY	F02G2254/10		158
F02G2254/11	9	Catalytic burners	CPCONLY	F02G2254/11		112
F02G2254/12	8	by ejectors	CPCONLY	F02G2254/12		1
F02G2254/15	8	by exhaust gas	CPCONLY	F02G2254/15		68
F02G2254/18	8	using deflectors, e.g. spirals	CPCONLY	F02G2254/18		7
F02G2254/20	8	using heat transfer tubes	CPCONLY	F02G2254/20		33
F02G2254/30	8	using solar radiation	CPCONLY	F02G2254/30		353
F02G2254/40	8	using heat accumulators	CPCONLY	F02G2254/40		32
F02G2254/45	8	by electric heating	CPCONLY	F02G2254/45		21
F02G2254/50	8	Dome arrangements for heat input	CPCONLY	F02G2254/50		41
F02G2254/60	8	using air preheaters	CPCONLY	F02G2254/60		27
F02G2254/70	8	by catalytic conversion, i.e. flameless oxydation	CPCONLY	F02G2254/70		16
F02G2254/90	8	by radioactivity	CPCONLY	F02G2254/90		17
F02G2255/00	7	Heater tubes	CPCONLY	F02G2255/00		157
F02G2255/10	8	dome shaped	CPCONLY	F02G2255/10		31
F02G2255/20	8	Heater fins	CPCONLY	F02G2255/20		46
F02G2256/00	7	Coolers	CPCONLY	F02G2256/00		46
F02G2256/02	8	Cooler fins	CPCONLY	F02G2256/02		21
F02G2256/04	8	Cooler tubes	CPCONLY	F02G2256/04		38
F02G2256/50	8	with coolant circulation	CPCONLY	F02G2256/50		24
F02G2257/00	7	Regenerators	CPCONLY	F02G2257/00		162
F02G2257/02	8	rotating	CPCONLY	F02G2257/02		5
F02G2258/00	7	Materials used	CPCONLY	F02G2258/00		15
F02G2258/10	8	ceramic	CPCONLY	F02G2258/10		237
F02G2258/20	8	having heat insulating properties	CPCONLY	F02G2258/20		19
F02G2258/50	8	having frictional properties	CPCONLY	F02G2258/50		7
F02G2258/80	8	having magnetic properties	CPCONLY	F02G2258/80		18
F02G2258/90	8	Processing of materials	CPCONLY	F02G2258/90		8
F02G2260/00	7	Recuperating heat from exhaust gases of combustion engines and heat from cooling circuits	CPCONLY	F02G2260/00		410
F02G2262/00	7	Recuperating heat from exhaust gases of combustion engines and heat from lubrication circuits	CPCONLY	F02G2262/00		33
F02G2270/00	7	Constructional features	CPCONLY	F02G2270/00		29
F02G2270/005	8	Shells, e.g. a sealed or sealing shell for a Stirling engine	CPCONLY	F02G2270/005		8
F02G2270/02	8	Pistons for reciprocating and rotating	CPCONLY	F02G2270/02		55
F02G2270/04	8	Roller assemblies connecting opposed pistons	CPCONLY	F02G2270/04		
F02G2270/10	8	Rotary pistons	CPCONLY	F02G2270/10		65
F02G2270/15	8	Rotating cylinders	CPCONLY	F02G2270/15		7
F02G2270/20	8	Plural piston swash plates	CPCONLY	F02G2270/20		60
F02G2270/30	8	Displacer assemblies	CPCONLY	F02G2270/30		75
F02G2270/40	8	Piston assemblies	CPCONLY	F02G2270/40		124
F02G2270/42	8	Displacer drives	CPCONLY	F02G2270/42		38
F02G2270/425	9	the displacer being driven by a four-bar mechanism, e.g. a rhombic mechanism	CPCONLY	F02G2270/425		68
F02G2270/45	8	Piston rods	CPCONLY	F02G2270/45		64
F02G2270/50	8	Crosshead guiding pistons	CPCONLY	F02G2270/50		169
F02G2270/55	8	Cylinders	CPCONLY	F02G2270/55		49
F02G2270/60	8	Counterweights for pistons	CPCONLY	F02G2270/60		8
F02G2270/70	8	Liquid pistons	CPCONLY	F02G2270/70		80
F02G2270/80	8	Engines without crankshafts	CPCONLY	F02G2270/80		39
F02G2270/85	8	Crankshafts	CPCONLY	F02G2270/85		300
F02G2270/90	8	Valves	CPCONLY	F02G2270/90		48
F02G2270/95	8	Pressurised crankcases	CPCONLY	F02G2270/95		26
F02G2275/00	7	Controls	CPCONLY	F02G2275/00		14
F02G2275/10	8	for vibration reduction	CPCONLY	F02G2275/10		26
F02G2275/20	8	for preventing piston over stroke	CPCONLY	F02G2275/20		29
F02G2275/30	8	for proper burning	CPCONLY	F02G2275/30		7
F02G2275/40	8	for starting	CPCONLY	F02G2275/40		62
F02G2280/00	7	Output delivery	CPCONLY	F02G2280/00		34
F02G2280/005	8	Medical applications, e.g. for prosthesis or artificial hearts	CPCONLY	F02G2280/005		11
F02G2280/10	8	Linear generators	CPCONLY	F02G2280/10		153
F02G2280/20	8	Rotary generators	CPCONLY	F02G2280/20		122
F02G2280/50	8	Compressors or pumps	CPCONLY	F02G2280/50		59
F02G2280/60	8	Heat pumps	CPCONLY	F02G2280/60		28
F02G2280/70	8	Clutches	CPCONLY	F02G2280/70		6
F02G2290/00	7	Engines characterised by the use of a particular power transfer medium, e.g. Helium	CPCONLY	F02G2290/00		25
