← Capabilities
- International families
- 5,2032015 to 2024
- Leading country
- United States1.8× the next
- All families
- 29khome filings included
- Over five years
- Rising2020 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
China
South Korea
Japan
France
Germany
United Kingdom
Russia
Canada
Sweden
1,350
770
623
609
519
271
230
225
125
65
| 2000 to 2025 | ||||||
|---|---|---|---|---|---|---|
| 1 | United States | 1,350 | 25.9% | 1.0× | 1,952 | |
| 2 | China | 770 | 14.8% | 2.6× | 15,465 | |
| 3 | South Korea | 623 | 12.0% | 1.2× | 3,938 | |
| 4 | Japan | 609 | 11.7% | 0.6× | 3,853 | |
| 5 | France | 519 | 10.0% | 1.3× | 686 | |
| 6 | Germany | 271 | 5.2% | 0.7× | 390 | |
| 7 | United Kingdom | 230 | 4.4% | 1.8× | 292 | |
| 8 | Russia | 225 | 4.3% | 0.6× | 970 | |
| 9 | Canada | 125 | 2.4% | 1.3× | 168 | |
| 10 | Sweden | 65 | 1.2% | 0.7× | 71 | |
| 11 | Switzerland | 37 | 0.7% | 0.7× | 39 | |
| 12 | Italy | 37 | 0.7% | 3.1× | 51 | |
| 13 | Czechia | 31 | 0.6% | 0.6× | 74 | |
| 14 | Finland | 25 | 0.5% | 1.8× | 28 | |
| 15 | Spain | 25 | 0.5% | 1.3× | 40 | |
| 16 | Denmark | 23 | 0.4% | 6.7× | 27 | |
| 17 | Netherlands | 22 | 0.4% | 0.6× | 22 | |
| 18 | Australia | 22 | 0.4% | 0.5× | 24 | |
| 19 | Taiwan | 21 | 0.4% | 0.5× | 73 | |
| 20 | India | 17 | 0.3% | 1.4× | 23 | |
| 21 | Belgium | 14 | 0.3% | 1.0× | 14 | |
| 22 | Türkiye | 13 | 0.2% | 5.5× | 20 | |
| 23 | Brazil | 12 | 0.2% | 1.0× | 24 | |
| 24 | Austria | 10 | 0.2% | 1.0× | 14 | |
| 25 | Norway | 9 | 0.2% | 0.3× | 9 | |
| 26 | Singapore | 8 | 0.2% | 0.1× | 8 | |
| 27 | New Zealand | 7 | 0.1% | 1.3× | 9 | |
| 28 | Israel | 6 | 0.1% | 2.0× | 8 | |
| 29 | Luxembourg | 6 | 0.1% | 0.0× | 6 | |
| 30 | Saudi Arabia | 6 | 0.1% | 0.2× | 14 | |
| 31 | Poland | 5 | 0.1% | 0.7× | 40 | |
| 32 | Ireland | 3 | 0.1% | 0.5× | 3 | |
| 33 | Hungary | 3 | 0.1% | 2.0× | 17 | |
| 34 | South Africa | 1 | 0.0% | 0.0× | 1 | |
| 35 | Cayman Islands | 1 | 0.0% | 0.0× | 14 | |
| 36 | Liechtenstein | 1 | 0.0% | 0.0× | 1 | |
| 37 | Mexico | 1 | 0.0% | 0.0× | 2 | |
| 38 | Malaysia | 1 | 0.0% | – | 2 | |
| 39 | Portugal | 1 | 0.0% | 0.0× | 2 |
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 Advanced Nuclear & Fusion. Names are as held in the source and are not consolidated across subsidiaries.
Global
5,203 international families
CGN POWER CO LTD · China
WESTINGHOUSE ELECTRIC CO LLC · United States
KOREA HYDRO & NUCLEAR POWER CO · South Korea
CHINA GENERAL NUCLEAR POWER · China
COMMISSARIAT ENERGIE ATOMIQUE · France
CHINA NUCLEAR POWER ENG CO LTD · China
211
203
202
200
185
173
United States
1,350 international families
WESTINGHOUSE ELECTRIC CO LLC
GE HITACHI NUCLEAR ENERGY AMERICAS LLC
TERRAPOWER LLC
NUSCALE POWER LLC
HOLTEC INTERNATIONAL
BWXT ADVANCED TECH LLC
203
98
59
57
35
29
China
770 international families
CGN POWER CO LTD
CHINA GENERAL NUCLEAR POWER
CHINA NUCLEAR POWER ENG CO LTD
CHINA NUCLEAR POWER TECHNOLOGY RES INST CO LTD
CHINA NUCLEAR POWER INST CO LTD
CHINA NUCLEAR POWER DESIGN COMPANY LTD SHENZHEN
211
200
173
156
132
66
South Korea
623 international families
KOREA HYDRO & NUCLEAR POWER CO
KOREA ATOMIC ENERGY RES
KEPCO NUCLEAR FUEL CO LTD
KEPCO ENG & CONSTR CO INC
KOREA HYDRO NUCLEAR POWER CO LTD
DOOSAN ENERBILITY CO LTD
202
112
59
25
18
17
Japan
609 international families
HITACHI GE NUCLEAR ENERGY LTD
MITSUBISHI HEAVY IND LTD
HITACHI LTD
TOSHIBA KK
TOSHIBA CORP
MITSUBISHI ELECTRIC CORP
124
67
37
35
32
25
France
519 international families
COMMISSARIAT ENERGIE ATOMIQUE
FRAMATOME SA
ELECTRICITE DE FRANCE
CENTRE NAT RECH SCIENT
COMMISSARIAT A L ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
AREVA NP
185
108
47
37
37
28
Similar capabilities
The nine capabilities that share the most international patent families with Advanced Nuclear & Fusion, 2015 to 2024: the families counted in both as a share of those counted in either. Each card shows its five largest countries.
Strategic Infrastructure
Nuclear Generation
59.8% shared · 3,481 families in both
China
United States
South Korea
Japan
France
973
912
510
459
398
Strategic Infrastructure
Nuclear Fuel Cycle & Radioactive Waste
31.7% shared · 1,775 families in both
United States
South Korea
France
Japan
China
589
294
275
227
207
Strategic Infrastructure
Research & Scientific Facilities
7.9% shared · 626 families in both
United States
Japan
Germany
China
United Kingdom
964
589
405
369
209
National Security
Stockpile Stewardship & Sustainment
7.0% shared · 362 families in both
United States
Japan
France
China
Germany
118
62
39
27
23
Critical Technology
Nuclear Medicine & Radioisotope Technologies
1.5% shared · 255 families in both
United States
China
Japan
Germany
South Korea
4,153
2,013
1,410
792
720
Critical Technology
Advanced Propulsion & Hypersonic Systems
0.9% shared · 61 families in both
United States
France
Germany
Japan
China
732
229
172
130
104
Strategic Infrastructure
Water Supply & Treatment
0.8% shared · 231 families in both
United States
China
Japan
South Korea
Germany
5,013
4,301
3,866
1,986
1,665
Strategic Infrastructure
Thermal Generation
0.8% shared · 225 families in both
United States
Japan
France
Germany
Canada
8,591
2,775
2,550
2,150
1,458
Strategic Infrastructure
Wastewater & Sanitation
0.7% shared · 243 families in both
United States
China
Japan
South Korea
Germany
5,326
5,281
4,432
2,243
2,077
Crosswalk
How Advanced Nuclear & Fusion is matched to the patent classifications. The entries below were chosen for it; each stands for itself and everything beneath it in the scheme, 454 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 |
|---|---|---|---|---|---|
| G21B | Fusion reactors | Fusion reactors | 16 | 14 | 27,379 |
| G21C | Nuclear reactors | Nuclear reactors, fuel elements and fuel handling | 325 | 234 | 425,017 |
| G21D | Nuclear power plant | Nuclear power plant | 40 | 27 | 52,557 |
| G21F9/00 | Treating radioactively contaminated material; Decontamination arrangements therefor | Treatment of radioactive waste and decontamination | 35 | 19 | 117,141 |
| B01D59/00 | Separation of different isotopes of the same chemical element | Isotope separation, including enrichment | 27 | 29 | 22,573 |
| H05H1/02 | Arrangements for confining plasma by electric or magnetic fields; Arrangements for heating plasma | Magnetic confinement and heating of plasma | 14 | 13 | 11,153 |
| C01G43/00 | Compounds of uranium | Uranium compounds | 12 | 8 | 10,570 |
| G21B3/00 | Low temperature nuclear fusion reactors, e.g. alleged cold fusion reactors | Left out |
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 Advanced Nuclear & Fusion: 469 codes on 459,993 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 |
|---|---|---|---|---|
| G21C15/18 | Emergency cooling arrangements; Removing shut-down heat | G21C | In the scheme | 8,414 |
| G21F9/12 | Processing by absorption; by adsorption; by ion-exchange | G21F9/00 | In the scheme | 6,848 |
| G21C17/00 | Monitoring; Testing ; Maintaining | G21C | In the scheme | 6,407 |
| G21C21/02 | Manufacture of fuel elements or breeder elements contained in non-active casings | G21C | In the scheme | 5,010 |
| G21F9/30 | Processing | G21F9/00 | In the scheme | 4,875 |
| G21C13/02 | Details | G21C | In the scheme | 4,653 |
| G21F9/02 | Treating gases | G21F9/00 | In the scheme | 4,645 |
| G21C3/07 | Casings; Jackets characterised by their material, e.g. alloys | G21C | In the scheme | 4,489 |
| G21F9/06 | Processing | G21F9/00 | In the scheme | 4,467 |
| G21C17/10 | Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain | G21C | In the scheme | 4,462 |
| G21D3/04 | Safety arrangements | G21D | In the scheme | 4,376 |
| G21D1/02 | Arrangements of auxiliary equipment | G21D | In the scheme | 4,314 |
| G21C17/06 | Devices or arrangements for monitoring or testing fuel or fuel elements outside the reactor core, e.g. for burn-up, for contamination | G21C | In the scheme | 4,258 |
| G21C3/322 | Means to influence the coolant flow through or around the bundles | G21C | In the scheme | 4,178 |
| G21C3/623 | Oxide fuels | G21C | In the scheme | 4,131 |
| G21C17/017 | Inspection or maintenance of pipe-lines or tubes in nuclear installations | G21C | In the scheme | 4,110 |
| G21D3/001 | Computer implemented control | G21D | In the scheme | 4,106 |
| G21F9/28 | Treating solids | G21F9/00 | In the scheme | 3,650 |
| G21F9/34 | Disposal of solid waste | G21F9/00 | In the scheme | 3,641 |
| G21C19/07 | Storage racks; Storage pools | G21C | In the scheme | 3,473 |
| G21C3/32 | Bundles of parallel pin-, rod-, or tube-shaped fuel elements | G21C | In the scheme | 3,310 |
| G21D1/00 | Details of nuclear power plant | G21D | In the scheme | 3,309 |
| G21C19/46 | Aqueous processes, e.g. by using organic extraction means, including the regeneration of these means | G21C | In the scheme | 3,121 |
| G21F9/36 | Disposal of solid waste by packaging; by baling | G21F9/00 | In the scheme | 3,093 |
| G21C17/108 | Measuring reactor flux | G21C | In the scheme | 3,086 |
| G21C7/12 | Means for moving control elements to desired position | G21C | In the scheme | 3,064 |
| G21C15/02 | Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices | G21C | In the scheme | 2,887 |
| G21C19/02 | Details of handling arrangements | G21C | In the scheme | 2,841 |
| G21C19/207 | Assembling, maintenance or repair of reactor components | G21C | In the scheme | 2,795 |
| G21C3/334 | Assembling, maintenance or repair of the bundles | G21C | In the scheme | 2,787 |
| G21C3/62 | Ceramic fuel | G21C | In the scheme | 2,776 |
| G21C21/00 | Apparatus or processes specially adapted to the manufacture of reactors or parts thereof | G21C | In the scheme | 2,682 |
| G21C9/00 | Emergency protection arrangements structurally associated with the reactor, e.g. safety valves provided with pressure equalisation devices | G21C | In the scheme | 2,662 |
| G21C19/20 | Arrangements for introducing objects into the pressure vessel; Arrangements for handling objects within the pressure vessel; Arrangements for removing objects from the pressure vessel | G21C | In the scheme | 2,534 |
| G21C3/20 | Details of the construction within the casing with coating on fuel or on inside of casing; with non-active interlayer between casing and active material with multiple casings or multiple active layers | G21C | In the scheme | 2,519 |
| G21C19/32 | Apparatus for removing radioactive objects or materials from the reactor discharge area, e.g. to a storage place; Apparatus for handling radioactive objects or materials within a storage place or removing them therefrom | G21C | In the scheme | 2,505 |
| G21D3/06 | Safety arrangements responsive to faults within the plant | G21D | In the scheme | 2,445 |
| G21C1/03 | Fast fission reactors, i.e. reactors not using a moderator ; Metal cooled reactors; Fast breeders cooled by a coolant not essentially pressurised, e.g. pool-type reactors | G21C | In the scheme | 2,337 |
| G21C7/08 | Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of solid control elements, e.g. control rods | G21C | In the scheme | 2,309 |
| C01G43/025 | Uranium dioxide | C01G43/00 | In the scheme | 2,298 |
| G21C3/326 | Bundles of parallel pin-, rod-, or tube-shaped fuel elements comprising fuel elements of different composition; comprising, in addition to the fuel elements, other pin-, rod-, or tube-shaped elements, e.g. control rods, grid support rods, fertile rods, poison rods or dummy rods | G21C | In the scheme | 2,287 |
| G21C7/10 | Construction of control elements | G21C | In the scheme | 2,216 |
| G21C9/004 | Pressure suppression | G21C | In the scheme | 2,197 |
| G21C13/00 | Pressure vessels; Containment vessels; Containment in general | G21C | In the scheme | 2,148 |
| G21C1/32 | Integral reactors, i.e. reactors wherein parts functionally associated with the reactor but not essential to the reaction, e.g. heat exchangers, are disposed inside the enclosure with the core | G21C | In the scheme | 2,146 |
| G21C19/307 | Arrangements for introducing fluent material into the reactor core; Arrangements for removing fluent material from the reactor core with continuous purification of circulating fluent material, e.g. by extraction of fission products deterioration or corrosion products, impurities, e.g. by cold traps specially adapted for liquids | G21C | In the scheme | 2,139 |
| G21B1/05 | Thermonuclear fusion reactors with magnetic or electric plasma confinement | G21B | In the scheme | 2,131 |
| G21C19/10 | Lifting devices or pulling devices adapted for co-operation with fuel elements or with control elements | G21C | In the scheme | 2,124 |
| G21C15/12 | Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices from pressure vessel; from containment vessel | G21C | In the scheme | 2,105 |
| G21C3/04 | Constructional details | G21C | In the scheme | 2,041 |
| G21B1/11 | Details | G21B | In the scheme | 2,024 |
| G21C1/02 | Fast fission reactors, i.e. reactors not using a moderator ; Metal cooled reactors; Fast breeders | G21C | In the scheme | 1,994 |
| G21F9/305 | Glass or glass like matrix | G21F9/00 | In the scheme | 1,989 |
| G21C3/06 | Casings; Jackets | G21C | In the scheme | 1,972 |
| B01D59/34 | Separation by photochemical methods | B01D59/00 | In the scheme | 1,934 |
| G21C5/06 | Means for locating or supporting fuel elements | G21C | In the scheme | 1,931 |
| G21C3/34 | Spacer grids | G21C | In the scheme | 1,890 |
| G21C5/02 | Details | G21C | In the scheme | 1,887 |
| G21C7/36 | Control circuits | G21C | In the scheme | 1,880 |
| C01G43/00 | Compounds of uranium | C01G43/00 | In the scheme | 1,877 |
| G21C3/33 | Supporting or hanging of elements in the bundle; Means forming part of the bundle for inserting it into, or removing it from, the core; Means for coupling adjacent bundles | G21C | In the scheme | 1,857 |
| G21C13/024 | Supporting constructions for pressure vessels or containment vessels | G21C | In the scheme | 1,840 |
| G21C15/243 | Promoting flow of the coolant for liquids | G21C | In the scheme | 1,834 |
| G21C7/14 | Mechanical drive arrangements | G21C | In the scheme | 1,827 |
| G21F9/00 | Treating radioactively contaminated material; Decontamination arrangements therefor | G21F9/00 | In the scheme | 1,821 |
| G21C5/10 | Means for supporting the complete structure | G21C | In the scheme | 1,810 |
| G21F9/004 | Decontamination of the surface of objects with chemical or electrochemical processes of metallic surfaces | G21F9/00 | In the scheme | 1,803 |
| G21C19/00 | Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel | G21C | In the scheme | 1,799 |
| G21C13/036 | Joints between tubes and vessel walls, e.g. taking into account thermal stresses the tube passing through the vessel wall, i.e. continuing on both sides of the wall | G21C | In the scheme | 1,796 |
| G21F9/04 | Treating liquids | G21F9/00 | In the scheme | 1,789 |
| G21B1/13 | First wall; Blanket; Divertor | G21B | In the scheme | 1,780 |
| G21C9/016 | Core catchers | G21C | In the scheme | 1,779 |
| G21F9/08 | Processing by evaporation; by distillation | G21F9/00 | In the scheme | 1,766 |
| G21C3/16 | Details of the construction within the casing | G21C | In the scheme | 1,754 |
| G21C1/08 | Heterogeneous reactors, i.e. in which fuel and moderator are separated moderator being highly pressurised, e.g. boiling water reactor, integral super-heat reactor, pressurised water reactor | G21C | In the scheme | 1,750 |
| G21D3/08 | Regulation of any parameters in the plant | G21D | In the scheme | 1,691 |
| G21C3/328 | Relative disposition of the elements in the bundle lattice | G21C | In the scheme | 1,688 |
| G21C17/112 | Measuring temperature | G21C | In the scheme | 1,687 |
| G21C3/10 | End closures ; Means for tight mounting therefor | G21C | In the scheme | 1,673 |
| G21F9/001 | Decontamination of contaminated objects, apparatus, clothes, food; Preventing contamination thereof | G21F9/00 | In the scheme | 1,673 |
| G21D1/003 | Nuclear facilities decommissioning arrangements | G21D | In the scheme | 1,658 |
| C01G43/01 | Oxides; Hydroxides | C01G43/00 | In the scheme | 1,654 |
| G21C17/003 | Remote inspection of vessels, e.g. pressure vessels | G21C | In the scheme | 1,653 |
| G21C3/30 | Assemblies of a number of fuel elements in the form of a rigid unit | G21C | In the scheme | 1,646 |
| G21D1/006 | Details of nuclear power plant primary side of steam generators | G21D | In the scheme | 1,642 |
| G21B1/057 | Tokamaks | G21B | In the scheme | 1,639 |
| G21C7/00 | Control of nuclear reaction | G21C | In the scheme | 1,613 |
| G21F9/32 | Processing by incineration | G21F9/00 | In the scheme | 1,577 |
| G21C19/48 | Non-aqueous processes | G21C | In the scheme | 1,573 |
| G21C17/022 | Devices or arrangements for monitoring coolant or moderator for monitoring liquid coolants or moderators | G21C | In the scheme | 1,569 |
| G21C1/00 | Reactor types | G21C | In the scheme | 1,521 |
| G21B1/00 | Thermonuclear fusion reactors | G21B | In the scheme | 1,520 |
| G21C15/28 | Selection of specific coolants ; Additions to the reactor coolants, e.g. against moderator corrosion | G21C | In the scheme | 1,520 |
| G21C1/322 | Integral reactors, i.e. reactors wherein parts functionally associated with the reactor but not essential to the reaction, e.g. heat exchangers, are disposed inside the enclosure with the core wherein the heat exchanger is disposed above the core | G21C | In the scheme | 1,512 |
| G21B1/23 | Optical systems, e.g. for irradiating targets, for heating plasma or for plasma diagnostics | G21B | In the scheme | 1,500 |
| G21C3/18 | Internal spacers or other non-active material within the casing, e.g. compensating for expansion of fuel rods or for compensating excess reactivity | G21C | In the scheme | 1,500 |
| G21C17/0225 | Chemical surface treatment, e.g. corrosion | G21C | In the scheme | 1,497 |
| G21C19/105 | Lifting devices or pulling devices adapted for co-operation with fuel elements or with control elements with grasping or spreading coupling elements | G21C | In the scheme | 1,496 |
| G21C3/626 | Coated fuel particles | G21C | In the scheme | 1,480 |
| G21C1/07 | Pebble-bed reactors; Reactors with granular fuel | G21C | In the scheme | 1,474 |
| G21C17/002 | Detection of leaks | G21C | In the scheme | 1,465 |
| G21C17/001 | Mechanical simulators | G21C | In the scheme | 1,459 |
| G21B1/19 | Targets for producing thermonuclear fusion reactions, e.g. pellets for irradiation by laser or charged particle beams | G21B | In the scheme | 1,451 |
| G21C15/182 | Emergency cooling arrangements; Removing shut-down heat comprising powered means, e.g. pumps | G21C | In the scheme | 1,441 |
| G21C19/40 | Arrangements for preventing occurrence of critical conditions, e.g. during storage | G21C | In the scheme | 1,441 |
| G21C9/02 | Means for effecting very rapid reduction of the reactivity factor under fault conditions, e.g. reactor fuse; Control elements having arrangements activated in an emergency | G21C | In the scheme | 1,415 |
| G21C11/06 | Reflecting shields, i.e. for minimising loss of neutrons | G21C | In the scheme | 1,412 |
| G21D3/00 | Control of nuclear power plant | G21D | In the scheme | 1,363 |
| G21D9/00 | Arrangements to provide heat for purposes other than conversion into power, e.g. for heating buildings | G21D | In the scheme | 1,360 |
| G21F9/008 | Apparatus specially adapted for mixing or disposing radioactively contamined material | G21F9/00 | In the scheme | 1,350 |
| G21C17/01 | Inspection of the inner surfaces of vessels | G21C | In the scheme | 1,344 |
| G21C3/60 | Metallic fuel; Intermetallic dispersions | G21C | In the scheme | 1,314 |
| G21C19/18 | Apparatus for bringing fuel elements to the reactor charge area, e.g. from a storage place | G21C | In the scheme | 1,308 |
| G21C1/20 | Heterogeneous reactors, i.e. in which fuel and moderator are separated moderator being substantially not pressurised, e.g. swimming-pool reactor moderator and coolant being different or separated, e.g. sodium-graphite reactor, sodium-heavy water reactor or organic coolant-heavy water reactor coolant being pressurised moderator being liquid, e.g. pressure-tube reactor | G21C | In the scheme | 1,283 |
| G21C9/012 | Pressure suppression by thermal accumulation or by steam condensation, e.g. ice condensers | G21C | In the scheme | 1,281 |
| G21C15/00 | Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants | G21C | In the scheme | 1,276 |
| G21C13/028 | Seals, e.g. for pressure vessels or containment vessels | G21C | In the scheme | 1,273 |
| G21C13/073 | Closures for reactor-vessels, e.g. rotatable | G21C | In the scheme | 1,248 |
| G21F9/16 | Processing by fixation in stable solid media | G21F9/00 | In the scheme | 1,240 |
| G21F9/14 | Processing by incineration; by calcination, e.g. desiccation | G21F9/00 | In the scheme | 1,233 |
| G21C3/3563 | Supporting members formed only by deformations in the strips | G21C | In the scheme | 1,228 |
| G21C15/14 | Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices from headers; from joints in ducts | G21C | In the scheme | 1,212 |
| G21C15/25 | Promoting flow of the coolant for liquids using jet pumps | G21C | In the scheme | 1,209 |
| G21C13/087 | Metallic vessels | G21C | In the scheme | 1,202 |
| G21C19/205 | Interchanging of fuel elements in the core, i.e. fuel shuffling | G21C | In the scheme | 1,202 |
| G21C1/22 | Heterogeneous reactors, i.e. in which fuel and moderator are separated using liquid or gaseous fuel | G21C | In the scheme | 1,201 |
| G21C3/54 | Fused salt, oxide or hydroxide compositions | G21C | In the scheme | 1,198 |
| G21C7/117 | Clusters of control rods; Spider construction | G21C | In the scheme | 1,183 |
| G21F9/304 | Cement or cement-like matrix | G21F9/00 | In the scheme | 1,164 |
| G21C19/19 | Reactor parts specifically adapted to facilitate handling, e.g. to facilitate charging or discharging of fuel elements | G21C | In the scheme | 1,163 |
| G21F9/002 | Decontamination of the surface of objects with chemical or electrochemical processes | G21F9/00 | In the scheme | 1,162 |
| G21C7/04 | Control of nuclear reaction by using self-regulating properties of reactor materials, e.g. Doppler effect of burnable poisons | G21C | In the scheme | 1,156 |
| G21C15/247 | Promoting flow of the coolant for liquids for liquid metals | G21C | In the scheme | 1,154 |
| G21C17/013 | Inspection vehicles | G21C | In the scheme | 1,151 |
| H05H1/02 | Arrangements for confining plasma by electric or magnetic fields; Arrangements for heating plasma | H05H1/02 | In the scheme | 1,148 |
| G21D1/04 | Pumping arrangements | G21D | In the scheme | 1,147 |
| G21C3/352 | Spacer grids formed of assembled intersecting strips | G21C | In the scheme | 1,134 |
| G21C15/24 | Promoting flow of the coolant | G21C | In the scheme | 1,124 |
| G21C3/3206 | Means associated with the fuel bundle for filtering the coolant, e.g. nozzles, grids | G21C | In the scheme | 1,123 |
| G21B1/052 | Thermonuclear fusion reactors with magnetic or electric plasma confinement reversed field configuration | G21B | In the scheme | 1,122 |
| G21C3/324 | Coats or envelopes for the bundles | G21C | In the scheme | 1,113 |
| G21D5/02 | Reactor and engine structurally combined, e.g. portable | G21D | In the scheme | 1,108 |
| H05H1/16 | Arrangements for confining plasma by electric or magnetic fields; Arrangements for heating plasma using externally-applied electric and magnetic fields | H05H1/02 | In the scheme | 1,108 |
| G21F9/125 | Processing by absorption; by adsorption; by ion-exchange by solvent extraction | G21F9/00 | In the scheme | 1,105 |
| G21C7/24 | Selection of substances for use as neutron-absorbing material | G21C | In the scheme | 1,104 |
| G21F9/10 | Processing by flocculation | G21F9/00 | In the scheme | 1,101 |
| G21B1/15 | Particle injectors for producing thermonuclear fusion reactions, e.g. pellet injectors | G21B | In the scheme | 1,099 |
| G21C13/10 | Means for preventing contamination in the event of leakage, e.g. double wall | G21C | In the scheme | 1,095 |
| G21C7/22 | Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of a fluid or fluent neutron-absorbing material, e.g. by adding neutron-absorbing material to the coolant | G21C | In the scheme | 1,095 |
| G21C3/3305 | Lower nozzle | G21C | In the scheme | 1,089 |
Match: Direct
The capability is itself a technology or a kind of physical system, and the classification names it. Alleged cold fusion (G21B3) is carved out. The crosswalk is a first pass that nobody has reviewed.