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FUSION REACTORS (uncontrolled reactors G21J)
Definition statement
This subclass/group covers:

Reactors in which energy release is caused by the controlled fusion of atomic nuclei, namely:

Thermonuclear fusion reactors.

Low-temperature nuclear fusion reactors, e.g. alleged cold fusion reactors.

References relevant to classification in this subclass
This subclass/group does not cover:
Uncontrollable fusion reactions; applications thereof
Informative references
Attention is drawn to the following places, which may be of interest for search:
Controlled fission reactors
Generating plasma; Handling plasma
Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Confinement
Controlled compression of fusion nuclei to overcome their electrostatic repulsion.
Fusion
Combination of two or more nuclei to form a heavier nucleus, a by-product of which is the release of energy.
Thermonuclear
Relating to fusion at high temperatures.
Thermonuclear fusion reactors
Definition statement
This subclass/group covers:

systems and components for producing energy by nuclear fusion reactions taking place in a thermonuclear plasma, in particular all parts related to the confinement, ignition and sustainment of the plasma.

References relevant to classification in this group
This subclass/group does not cover:
Nuclear fission reactors
Low-temperature fusion systems
Investigating plasma
Generating plasma other than for nuclear fusion reactions
Special rules of classification within this group

The general rule of classification in this subclass follows the IPC rules, i.e. the invention information is classified with an EC class.

Hybrid fission-fusion nuclear reactors
Definition statement
This subclass/group covers:

Reactors composed of nuclear fusion systems combined with nuclear fission systems, whereby neutrons generated by the fusion reactions are used for generating nuclear fission reactions.

References relevant to classification in this group
This subclass/group does not cover:
Nuclear fission reactors
with inertial plasma confinement
Definition statement
This subclass/group covers:

Reactors in which nuclear fusion reactions are initiated by heating and compressing a fuel target, typically in the form of a pellet containing the nuclear fuel.

References relevant to classification in this group
This subclass/group does not cover:
Target compression by laser
Target compression by charged particle beam
H05H1/22C
with magnetic or electric plasma confinement
Definition statement
This subclass/group covers:

Reactors in which nuclear fusion reactions take place between atomic nuclei of a nuclear fuel in a plasma state, whereby magnetic fields are used to confine the plasma and electromagnetic fields are used to ignite and sustain the plasma.

References relevant to classification in this group
This subclass/group does not cover:
Arrangements for confining plasma
Closed loop vessels
Straight vessels
[N: reversed field configuration]
Definition statement
This subclass/group covers:

Reactors in which the plasma containment system comprises a chamber, a magnetic field generator for applying a magnetic field in a direction substantially along a principle axis, and an annular plasma layer that comprises a circulating beam of ions, wherein the internal magnetic field reverses direction.

References relevant to classification in this group
This subclass/group does not cover:
Arrangements for confining plasma
Straight vessels
[N: Stellarators]
Definition statement
This subclass/group covers:

Closed-loop reactors in which the magnetic confinement is produced with a single coil system. As the helical twisting of field lines is achieved solely with external coils, the later have to be twisted accordingly.

References relevant to classification in this group
This subclass/group does not cover:
Arrangements for confining plasma
Closed loop vessels
Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Torsatron
Stellarator with continuous helical coils
Heliotron
Stellarator with added poloidal field coils
Heliac
Stellarator in which the magnetic field forms a toroidal helix
Helias
Helical Advanced Stellarator
[N: Tokamaks]
Definition statement
This subclass/group covers:

Closed-loop reactors using magnetic fields to confine the plasma in the shape of a torus with a doughnut cross-section. A toroidal magnetic field is generated by electromagnets encircling the torus. A poloidal field is generated by a poloidal electric current that flows inside the plasma, this current being induced inside the plasma by a second set of electromagnets.

References relevant to classification in this group
This subclass/group does not cover:
Arrangements for confining plasma
Closed loop vessels
Straight vessels
Informative references
Attention is drawn to the following places, which may be of interest for search:
First wall, blanket, divertor
Synonyms and Keywords

In patent documents the following abbreviations are often used:

ITER
International Thermonuclear Reactor
JET
Joint European Torus
ASDEX
Axial Symmetric Divertor Experiment
Details
Definition statement
This subclass/group covers:

Specific components of the inertial and/or magnetic fusion confinement reactors and auxiliary systems associated, e.g. electromagnets.

References relevant to classification in this group
This subclass/group does not cover:
Electromagnets in general
Magnets for particle accelerators
Electrical components and details
Informative references
Attention is drawn to the following places, which may be of interest for search:
Details of closed-loop containment structures
Lasers for injection plasma heating
Targets for producing thermonuclear reactions
[N: Tritium recovery]
Definition statement
This subclass/group covers:

Systems and methods for recovering the tritium generated in the blanket of a nuclear fusion reactor.

First wall; Blanket; Divertor
Definition statement
This subclass/group covers:

Details of the structural elements in contact with the plasma and/or affected by the fusion generated neutrons, and auxiliary systems associated, e.g. first wall cooling systems.

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
FW
First wall
Particle injectors for producing thermonuclear fusion reactions, e.g. pellet injectors
Definition statement
This subclass/group covers:

Systems and methods for injecting the nuclear fuel targets (e.g. pellets) into an inertial confinement reactor, and the nuclear fuel into the plasma in a magnetic confinement reactor.

References relevant to classification in this group
This subclass/group does not cover:
Lasers and related optical systems for producing plasma by target irradiation
Vacuum chambers; Vacuum systems
Definition statement
This subclass/group covers:

The reactor vessel in which the fusion reactions take place, and the auxiliary systems associated, e.g. systems for creating the desired pressure conditions within the vessel.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Closed loop vessels
Straight vessels
Targets for producing thermonuclear fusion reactions, , e.g. pellets for irradiation by laser or charged particle beams
Definition statement
This subclass/group covers:

Targets containing the nuclear fuel apt to generate nuclear fusion reactions under compression, e.g. pellets for irradiation by laser or charged particle beams.

References relevant to classification in this group
This subclass/group does not cover:
Targets for producing nuclear reactions
Informative references
Attention is drawn to the following places, which may be of interest for search:
Lasers for target irradiation
Electric power supply systems, e.g. for magnet systems, switching devices, storage devices, circuit arrangements [N: (methods or means for discharging superconducting storage windings H01F 6/003)]
Definition statement
This subclass/group covers:

All the circuits and devices used in a nuclear fusion power plant for supplying energy to the plasma energizing systems.

References relevant to classification in this group
This subclass/group does not cover:
Systems for supplying RF to particle accelerators
Means for discharging superconducting storage windings
Optical systems, e.g. for irradiating targets, for heating plasma or for plasma diagnostics
Definition statement
This subclass/group covers:

All the devices and systems used for irradiating fuel targets in an inertial confinement reactor (e.g. lasers), and the devices and systems using irradiation methods for measuring plasma parameters in nuclear fusion reactors.

References relevant to classification in this group
This subclass/group does not cover:
Arrangements for investigating plasma in systems other than nuclear fusion reactors
Lasers in general
Informative references
Attention is drawn to the following places, which may be of interest for search:
Arrangements for sustaining plasma by injection heating in laboratory systems
Maintenance, e.g. repair or remote inspection
Definition statement
This subclass/group covers:

Auxiliary equipments used for the construction, inspection, maintenance and repair of systems and components of nuclear fusion power plants.

Low temperature nuclear fusion reactors, e.g. alleged cold fusion reactors
Definition statement
This subclass/group covers:

Systems and components for producing energy by nuclear reactions not involving the generation of a thermonuclear plasma, e.g. fusion reactions.

References relevant to classification in this group
This subclass/group does not cover:
Conversion of elements by electromagnetic or particle irradiation
Radioactive sources
Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Cold fusion
Nuclear (fusion) reactions taking place at ordinary temperatures
Thermonuclear fusion
Nuclear fusion reactions involving the generation of a plasma at extremely high temperatures(i.e. million degrees)
[N: Fusion by absorption in a matrix]
Definition statement
This subclass/group covers:

Systems and methods for inducing fusion of hydrogen isotopes by diffusion in a host matrix, or reactions of hydrogen isotopes with the nuclei of a host matrix at ordinary temperatures.

[N: Catalyzed fusion, e.g. muon-catalyzed fusion]
Definition statement
This subclass/group covers:

Systems and methods for inducing fusion of hydrogen isotope nuclei by using the catalyzing properties of muons in a hydrogen isotope environment.

[N: Fusion by impact e.g. cluster/beam interaction, ion beam collisions, impact on a target]
Definition statement
This subclass/group covers:

Systems and methods for promoting nuclear fusion at ordinary temperatures using a beam of particles reacting with other particles or with a target.

References relevant to classification in this group
This subclass/group does not cover:
Conversion of elements by electromagnetic or particle irradiation
[N: Fusion by pressure waves]
Definition statement
This subclass/group covers:

Systems and methods for promoting nuclear fusion of a (gaseous, liquid or solid) target by subjecting it to pressure or shock waves.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Sonoluminescence
H05H1/24A6
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Last Modified: 10/11/2013