Strategic Infrastructure

Thermal Generation

Thermal generation refers to the production of electricity from the combustion of fossil fuels, including coal-fired, gas-fired and liquid-fuelled power stations and co-generation plants. One of the capabilities of Energy Infrastructure.

International families: 24k2015 to 2024
Leading country: United States3.1× the next
All families: 77khome filings included
Over five years: Falling2020 to 2024 against the five before

Year by year

Patent families by country of origin and the year of the earliest filing, 2000 to 2025; 2025 is a part year, still filling in. International families are those for which protection was sought beyond one country.

Volume

International patent families in the capability, by the year of the earliest filing.

Source: Global Institute for National Capability (GINC), 2026. Underlying patents from 107 patent offices, IFI CLAIMS and Google

Share by country

Each country's share of the year's international families, in per cent: the capability's five largest countries of origin, 2015 to 2024, and the rest of the world.

Source: Global Institute for National Capability (GINC), 2026. Underlying patents from 107 patent offices, IFI CLAIMS and Google

Country leaderboard

International patent families, 2015 to 2024, by country of origin. Growth compares the latest five full years with the five before.

Ten largest

United States

Japan

France

Germany

Canada

United Kingdom

China

South Korea

Italy

Switzerland

8,591

2,775

2,550

2,150

1,458

1,448

1,334

828

638

517


1	United States	8,591	35.5%	0.6×	11,223
2	Japan	2,775	11.5%	0.7×	6,008
3	France	2,550	10.5%	1.0×	3,906
4	Germany	2,150	8.9%	0.5×	3,114
5	Canada	1,458	6.0%	1.6×	1,620
6	United Kingdom	1,448	6.0%	0.7×	1,613
7	China	1,334	5.5%	1.6×	39,320
8	South Korea	828	3.4%	0.7×	4,347
9	Italy	638	2.6%	1.2×	766
10	Switzerland	517	2.1%	0.8×	537
11	Sweden	247	1.0%	0.5×	265
12	Finland	170	0.7%	0.7×	195
13	Netherlands	149	0.6%	1.7×	174
14	Belgium	129	0.5%	0.7×	169
15	Russia	113	0.5%	0.5×	1,242
16	Spain	109	0.5%	1.1×	160
17	Türkiye	105	0.4%	1.3×	173
18	Austria	86	0.4%	0.8×	109
19	Saudi Arabia	82	0.3%	0.4×	118
20	Taiwan	68	0.3%	0.5×	200
21	India	67	0.3%	0.8×	85
22	Denmark	66	0.3%	0.8×	69
23	Australia	59	0.2%	0.9×	82
24	Norway	53	0.2%	1.1×	62
25	Israel	45	0.2%	1.6×	66
26	Poland	45	0.2%	0.7×	214
27	Brazil	44	0.2%	0.5×	103
28	Singapore	30	0.1%	1.7×	32
29	Ireland	27	0.1%	1.1×	29
30	Czechia	26	0.1%	0.7×	51
31	South Africa	12	0.0%	0.7×	13
32	Mexico	12	0.0%	0.3×	36
33	Hungary	12	0.0%	0.3×	30
34	Portugal	11	0.0%	0.8×	13
35	Luxembourg	6	0.0%	0.2×	9
36	Liechtenstein	6	0.0%	0.2×	6
37	Hong Kong	5	0.0%	0.3×	8
38	New Zealand	4	0.0%	–	7
39	Malaysia	4	0.0%	3.0×	11
40	Cayman Islands	1	0.0%	0.0×	1

Applicants

The largest applicants by international patent families, 2015 to 2024: across the world, then within each of the five countries with the most families in Thermal Generation. Names are as held in the source and are not consolidated across subsidiaries.

Global

24,221 international families

GEN ELECTRIC · United States

PRATT & WHITNEY CANADA · Canada

GENERAL ELECTRIC CO GE · United States

RAYTHEON TECH CORP · United States

UNITED TECHNOLOGIES CORP · United States

ROLLS ROYCE PLC · United Kingdom

2,925

1,275

1,242

1,229

1,190

1,092

United States

8,591 international families

GEN ELECTRIC

GENERAL ELECTRIC CO GE

RAYTHEON TECH CORP

UNITED TECHNOLOGIES CORP

RTX CORP

HAMILTON SUNDSTRAND CORP

2,857

1,238

1,229

1,190

978

550

Japan

2,775 international families

MITSUBISHI HEAVY IND LTD

MITSUBISHI POWER LTD

MITSUBISHI HITACHI POWER SYS

IHI CORP

MITSUBISHI HITACHI POWER SYS LTD

KAWASAKI HEAVY IND LTD

836

614

455

235

158

147

France

2,550 international families

SAFRAN AIRCRAFT ENGINES

AIRBUS OPERATIONS SAS

SAFRAN TRANS SYSTEMS

SAFRAN

SAFRAN NACELLES

SAFRAN HELICOPTER ENGINES

1,036

257

218

172

163

161

Germany

2,150 international families

SIEMENS AG

ROLLS ROYCE DEUTSCHLAND LTD & CO KG

SIEMENS ENERGY GLOBAL GMBH & CO KG

MAN ENERGY SOLUTIONS SE

MTU Aero Engines AG

BOSCH GMBH ROBERT

398

290

242

113

108

Canada

China

United States

South Korea

Japan

France

973

912

510

459

398

Crosswalk

How Thermal Generation is matched to the patent classifications. The entries below were chosen for it; each stands for itself and everything beneath it in the scheme, 917 Cooperative entries in all. A patent family counts when any of its codes, in either scheme and at any office, falls under one of them. Codes since retired are placed under the entries that replaced them.

Entry	Title in the scheme	Why it is chosen	CPC codes	IPC codes	Documents
F01K	Steam engine plants; steam accumulators; engine plants not otherwise provided for; engines using special working fluids or cycles	Steam power plants and combined-cycle plants	150	98	201,406
F22	Steam generation	Steam boilers and steam generation	465	273	333,346
F02C	Gas-turbine plants; air intakes for jet-propulsion plants; controlling fuel supply in air-breathing jet-propulsion plants	Gas-turbine plants	141	122	460,141
F23C	Methods or apparatus for combustion using fluid fuel or solid fuel suspended in a carrier gas or air	Combustion of pulverised and fluid fuels in furnaces	154	57	157,963
F01D15/10	Adaptations for driving, or combinations with, electric generators	Turbines arranged to drive electric generators	1	1	28,921
Y02E20/14	Combined heat and power generation [CHP]	Tagged combined heat and power generation	1	none	24,584
Y02E20/16	Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]	Tagged combined-cycle power plants	1	none	29,014
Y02E20/18	Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]	Tagged integrated gasification combined cycle	1	none	16,287

CPC and IPC codes are the codes in use on patent documents, at any office, that fall under the entry. Documents is the larger of the two schemes' counts of documents carrying one of them. An entry with no IPC codes can be told apart only in the Cooperative scheme.

The Cooperative codes in use that count towards Thermal Generation: 914 codes on 1,144,926 documents. The 150 most used are listed; the full list is in the cpc-to-capability.csv download.

Code	Title	Under entry	How placed	Documents
Y02E20/16	Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]	Y02E20/16	In the scheme	29,014
F01D15/10	Adaptations for driving, or combinations with, electric generators	F01D15/10	In the scheme	25,799
Y02E20/14	Combined heat and power generation [CHP]	Y02E20/14	In the scheme	24,584
F02C7/36	Power transmission arrangements between the different shafts of the gas turbine plant, or between the gas-turbine plant and the power user	F02C	In the scheme	17,891
Y02E20/18	Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]	Y02E20/18	In the scheme	16,287
F02C7/18	Cooling of plants characterised by cooling medium the medium being gaseous, e.g. air	F02C	In the scheme	15,064
F02C6/12	Turbochargers, i.e. plants for augmenting mechanical power output of internal-combustion piston engines by increase of charge pressure	F02C	In the scheme	14,097
F01K23/10	Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle	F01K	In the scheme	13,950
F02C7/22	Fuel supply systems	F02C	In the scheme	13,745
F01K13/02	Controlling, e.g. stopping or starting	F01K	In the scheme	13,536
F02C3/04	Gas-turbine plants characterised by the use of combustion products as the working fluid having a turbine driving a compressor	F02C	In the scheme	13,472
F02C7/06	Arrangements of bearings; Lubricating	F02C	In the scheme	13,148
F02C6/18	Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants	F02C	In the scheme	13,114
F02C7/32	Arrangement, mounting, or driving, of auxiliaries	F02C	In the scheme	13,040
F02C9/28	Regulating systems responsive to plant or ambient parameters, e.g. temperature, pressure, rotor speed	F02C	In the scheme	12,798
F02C7/00	Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants	F02C	In the scheme	10,775
F02C9/18	Control of working fluid flow by bleeding, bypassing or acting on variable working fluid interconnections between turbines or compressors or their stages	F02C	In the scheme	9,820
F02C9/00	Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants	F02C	In the scheme	9,186
F02C6/08	Gas-turbine plants providing heated or pressurised working fluid for other apparatus, e.g. without mechanical power output providing compressed gas the gas being bled from the gas-turbine compressor	F02C	In the scheme	9,108
F02C7/20	Mounting or supporting of plant; Accommodating heat expansion or creep	F02C	In the scheme	8,777
F23C99/00	Subject-matter not provided for in other groups of this subclass	F23C	In the scheme	8,553
F02C7/28	Arrangement of seals	F02C	In the scheme	8,417
F01K13/00	General layout or general methods of operation of complete plants	F01K	In the scheme	8,363
F02C3/22	Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products the fuel or oxidant being gaseous at standard temperature and pressure	F02C	In the scheme	8,272
F02C7/04	Air intakes for gas-turbine plants or jet-propulsion plants	F02C	In the scheme	8,156
F01K25/08	Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours	F01K	In the scheme	7,898
F01K11/02	Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines	F01K	In the scheme	7,690
F01K25/10	Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether	F01K	In the scheme	7,659
F02C7/12	Cooling of plants	F02C	In the scheme	7,248
F02C7/224	Heating fuel before feeding to the burner	F02C	In the scheme	7,154
F02C7/14	Cooling of plants of fluids in the plant, e.g. lubricant or fuel	F02C	In the scheme	6,976
F02C6/00	Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use	F02C	In the scheme	6,919
F02C7/232	Fuel valves; Draining valves or systems	F02C	In the scheme	6,654
F02C7/045	Air intakes for gas-turbine plants or jet-propulsion plants having provisions for noise suppression	F02C	In the scheme	6,030
F02C7/222	Fuel flow conduits, e.g. manifolds	F02C	In the scheme	5,803
F02C7/24	Heat or noise insulation	F02C	In the scheme	5,799
F01K27/00	Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for	F01K	In the scheme	5,643
F01K23/065	Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle the combustion taking place in an internal combustion piston engine, e.g. a diesel engine	F01K	In the scheme	5,603
F02C3/30	Adding water, steam or other fluids for influencing combustion, e.g. to obtain cleaner exhaust gases	F02C	In the scheme	5,495
F22B1/18	Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines	F22	In the scheme	5,488
F01K25/103	Carbon dioxide	F01K	In the scheme	5,469
F23C10/10	Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases the separation apparatus being located outside the combustion chamber	F23C	In the scheme	5,358
F02C7/08	Heating air supply before combustion, e.g. by exhaust gases	F02C	In the scheme	5,202
F22B1/284	Methods of steam generation characterised by form of heating method in boilers heated electrically with water in reservoirs	F22	In the scheme	5,158
F02C9/26	Control of fuel supply	F02C	In the scheme	5,016
F02C7/047	Heating to prevent icing	F02C	In the scheme	5,003
F02C3/34	Gas-turbine plants characterised by the use of combustion products as the working fluid with recycling of part of the working fluid, i.e. semi-closed cycles with combustion products in the closed part of the cycle	F02C	In the scheme	4,852
F22B35/00	Control systems for steam boilers	F22	In the scheme	4,816
F02C7/143	Cooling of plants of fluids in the plant, e.g. lubricant or fuel of working fluid before or between the compressor stages	F02C	In the scheme	4,506
F01K7/16	Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type	F01K	In the scheme	4,481
F02C7/26	Starting; Ignition	F02C	In the scheme	4,395
F23C9/00	Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber	F23C	In the scheme	4,387
F02C3/14	Gas-turbine plants characterised by the use of combustion products as the working fluid characterised by the arrangement of the combustion chamber in the plant	F02C	In the scheme	4,343
F02C9/40	Control of fuel supply specially adapted to the use of a special fuel or a plurality of fuels	F02C	In the scheme	4,343
F02C3/107	Gas-turbine plants characterised by the use of combustion products as the working fluid having a turbine driving a compressor with two or more rotors connected by power transmission	F02C	In the scheme	4,218
F02C7/185	Cooling means for reducing the temperature of the cooling air or gas	F02C	In the scheme	4,184
F02C3/28	Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products the fuel or oxidant being solid or pulverulent, e.g. in slurry or suspension using a separate gas producer for gasifying the fuel before combustion	F02C	In the scheme	4,121
F02C3/20	Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products	F02C	In the scheme	4,077
F02C9/263	Control of fuel supply by means of fuel metering valves	F02C	In the scheme	4,058
F22B1/28	Methods of steam generation characterised by form of heating method in boilers heated electrically	F22	In the scheme	4,043
F22B33/18	Combinations of steam boilers with other apparatus	F22	In the scheme	4,002
F23C2900/9901	Combustion process using hydrogen, hydrogen peroxide water or brown gas as fuel	F23C	In the scheme	3,922
F02C6/16	Gas-turbine plants having means for storing energy, e.g. for meeting peak loads for storing compressed air	F02C	In the scheme	3,915
F01K23/101	Regulating means specially adapted therefor	F01K	In the scheme	3,809
F23C13/00	Apparatus in which combustion takes place in the presence of catalytic material	F23C	In the scheme	3,776
F01K17/02	Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic	F01K	In the scheme	3,740
F22B1/006	Methods of steam generation characterised by form of heating method using solar heat	F22	In the scheme	3,695
F02C7/16	Cooling of plants characterised by cooling medium	F02C	In the scheme	3,562
F23C10/18	Details; Accessories	F23C	In the scheme	3,433
F02C7/042	Air intakes for gas-turbine plants or jet-propulsion plants having variable geometry	F02C	In the scheme	3,417
F02C7/057	Control or regulation	F02C	In the scheme	3,402
F02C9/20	Control of working fluid flow by throttling; by adjusting vanes	F02C	In the scheme	3,402
F02C9/16	Control of working fluid flow	F02C	In the scheme	3,394
F02C7/141	Cooling of plants of fluids in the plant, e.g. lubricant or fuel of working fluid	F02C	In the scheme	3,353
F02C3/10	Gas-turbine plants characterised by the use of combustion products as the working fluid having a turbine driving a compressor with another turbine driving an output shaft but not driving the compressor	F02C	In the scheme	3,343
F02C7/228	Dividing fuel between various burners	F02C	In the scheme	3,325
F01K25/06	Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using mixtures of different fluids	F01K	In the scheme	3,310
F02C7/052	Air intakes for gas-turbine plants or jet-propulsion plants having provisions for obviating the penetration of damaging objects or particles with dust-separation devices	F02C	In the scheme	3,248
F01K9/003	Plants characterised by condensers arranged or modified to co-operate with the engines condenser cooling circuits	F01K	In the scheme	3,235
F22B1/1815	Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines using the exhaust gases of combustion engines using the exhaust gases of gas-turbines	F22	In the scheme	3,130
F01K7/22	Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating	F01K	In the scheme	3,111
F23C6/045	Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection with staged combustion in a single enclosure	F23C	In the scheme	3,054
F23C10/20	Inlets for fluidisation air, e.g. grids; Bottoms	F23C	In the scheme	3,051
F23C9/006	Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber the recirculation taking place in the combustion chamber	F23C	In the scheme	3,016
F23C3/002	Combustion apparatus characterised by the shape of the combustion chamber the chamber having an elongated tubular form, e.g. for a radiant tube	F23C	In the scheme	3,013
F22B31/0084	Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements or dispositions of combustion apparatus with combustion in a fluidized bed with recirculation of separated solids or with cooling of the bed particles outside the combustion bed	F22	In the scheme	2,905
F23C15/00	Apparatus in which combustion takes place in pulses influenced by acoustic resonance in a gas mass	F23C	In the scheme	2,876
F02C1/05	Gas-turbine plants characterised by the use of hot gases or unheated pressurised gases, as the working fluid the working fluid being heated indirectly characterised by the type or source of heat, e.g. using nuclear or solar energy	F02C	In the scheme	2,840
F23C7/002	Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion	F23C	In the scheme	2,758
F23C6/047	Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection with staged combustion in a single enclosure with fuel supply in stages	F23C	In the scheme	2,719
F01K13/006	Auxiliaries or details not otherwise provided for	F01K	In the scheme	2,682
F23C5/08	Disposition of burners	F23C	In the scheme	2,675
F23C7/02	Disposition of air supply not passing through burner	F23C	In the scheme	2,673
F23C7/004	Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes	F23C	In the scheme	2,667
F02C6/206	Adaptations of gas-turbine plants for driving vehicles the vehicles being airscrew driven	F02C	In the scheme	2,615
F23C6/04	Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection	F23C	In the scheme	2,614
F02C1/10	Closed cycles	F02C	In the scheme	2,592
F01K23/06	Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle	F01K	In the scheme	2,566
F02C7/236	Fuel delivery systems comprising two or more pumps	F02C	In the scheme	2,560
F01K7/32	Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure	F01K	In the scheme	2,524
F02C9/32	Control of fuel supply characterised by throttling of fuel	F02C	In the scheme	2,478
F02C7/268	Starting drives for the rotor, acting directly on the rotor of the gas turbine to be started	F02C	In the scheme	2,473
F01K27/02	Plants modified to use their waste heat, other than that of exhaust, e.g. engine-friction heat	F01K	In the scheme	2,470
F22D1/50	Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water	F22	In the scheme	2,427
F02C6/14	Gas-turbine plants having means for storing energy, e.g. for meeting peak loads	F02C	In the scheme	2,419
F22B37/00	Component parts or details of steam boilers	F22	In the scheme	2,403
F01K23/02	Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled	F01K	In the scheme	2,366
F02C7/266	Electric	F02C	In the scheme	2,347
F01K21/047	Steam engine plants not otherwise provided for using mixtures of steam and gas; Plants generating or heating steam by bringing water or steam into direct contact with hot gas having at least one combustion gas turbine	F01K	In the scheme	2,340
F23C3/00	Combustion apparatus characterised by the shape of the combustion chamber	F23C	In the scheme	2,322
F23C7/00	Combustion apparatus characterised by arrangements for air supply	F23C	In the scheme	2,310
F02C7/264	Ignition	F02C	In the scheme	2,307
F01K9/00	Plants characterised by condensers arranged or modified to co-operate with the engines	F01K	In the scheme	2,306
F01K25/00	Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for	F01K	In the scheme	2,275
F23C7/008	Flow control devices	F23C	In the scheme	2,275
F22B37/54	De-sludging or blow-down devices	F22	In the scheme	2,267
F01K3/12	Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having two or more accumulators	F01K	In the scheme	2,253
F02C7/05	Air intakes for gas-turbine plants or jet-propulsion plants having provisions for obviating the penetration of damaging objects or particles	F02C	In the scheme	2,253
F02C6/20	Adaptations of gas-turbine plants for driving vehicles	F02C	In the scheme	2,252
F22D11/06	Arrangements of feed-water pumps for returning condensate to boiler	F22	In the scheme	2,251
F22B31/08	Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion	F22	In the scheme	2,241
F02C7/275	Mechanical drives	F02C	In the scheme	2,208
F23C2201/20	Burner staging	F23C	In the scheme	2,206
F02C1/04	Gas-turbine plants characterised by the use of hot gases or unheated pressurised gases, as the working fluid the working fluid being heated indirectly	F02C	In the scheme	2,183
F02C3/305	Increasing the power, speed, torque or efficiency of a gas turbine or the thrust of a turbojet engine by injecting or adding water, steam or other fluids	F02C	In the scheme	2,180
F01K3/00	Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein	F01K	In the scheme	2,175
F23C9/08	Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for reducing temperature in combustion chamber, e.g. for protecting walls of combustion chamber	F23C	In the scheme	2,168
F22B31/00	Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements or dispositions of combustion apparatus	F22	In the scheme	2,147
F02C7/10	Heating air supply before combustion, e.g. by exhaust gases by means of regenerative heat-exchangers	F02C	In the scheme	2,144
F02C3/06	Gas-turbine plants characterised by the use of combustion products as the working fluid having a turbine driving a compressor the compressor comprising only axial stages	F02C	In the scheme	2,138
F02C7/277	Mechanical drives the starter being a separate turbine	F02C	In the scheme	2,103
F02C9/46	Emergency fuel control	F02C	In the scheme	2,095
F01K23/106	Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle with water evaporated or preheated at different pressures in exhaust boiler	F01K	In the scheme	2,062
F22B37/10	Water tubes; Accessories therefor	F22	In the scheme	2,059
F23C10/005	Fluidised bed combustion apparatus comprising two or more beds	F23C	In the scheme	2,051
F23C10/28	Control devices specially adapted for fluidised bed, combustion apparatus	F23C	In the scheme	2,032
F01K21/00	Steam engine plants not otherwise provided for	F01K	In the scheme	2,031
F02C7/1435	Cooling of plants of fluids in the plant, e.g. lubricant or fuel of working fluid before or between the compressor stages by water injection	F02C	In the scheme	2,019
F23C2900/06041	Staged supply of oxidant	F23C	In the scheme	2,002
F01K23/067	Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle the combustion heat coming from a gasification or pyrolysis process, e.g. coal gasification	F01K	In the scheme	1,993
F02C6/003	Gas-turbine plants with heaters between turbine stages	F02C	In the scheme	1,984
F02C7/055	Air intakes for gas-turbine plants or jet-propulsion plants having provisions for obviating the penetration of damaging objects or particles with intake grids, screens or guards	F02C	In the scheme	1,972
F22B1/22	Methods of steam generation characterised by form of heating method using combustion under pressure substantially exceeding atmospheric pressure	F22	In the scheme	1,951
F01K17/04	Using steam or condensate extracted or exhausted from steam engine plant for specific purposes other than heating	F01K	In the scheme	1,940
F23C2206/101	Entrained or fast fluidised bed	F23C	In the scheme	1,928
F02C3/067	Gas-turbine plants characterised by the use of combustion products as the working fluid having a turbine driving a compressor the compressor comprising only axial stages having counter-rotating rotors	F02C	In the scheme	1,925
F22B37/003	Maintenance, repairing or inspecting equipment positioned in or via the headers	F22	In the scheme	1,909
F22D1/32	Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines	F22	In the scheme	1,875
F22B35/18	Applications of computers to steam-boiler control	F22	In the scheme	1,861
F01K23/04	Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled condensation heat from one cycle heating the fluid in another cycle	F01K	In the scheme	1,859

Match: Direct

The capability is itself a technology or a kind of physical system, and the classification names it. F02C also holds aircraft gas turbines; turbine blading in general (F01D) is left out for that reason. The crosswalk is a first pass that nobody has reviewed.

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