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CPC Definition - Subclass F02K

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Last Updated Version: 2024.01
F02K
JET-PROPULSION PLANTS (features of jet-propulsion plants common to gas-turbine plants, air intakes or fuel supply control of air-breathing jet-propulsion plants F02C 7/00, F02C 9/00)
References
Limiting references

This place does not cover:

Features of jet-propulsion plants common to gas-turbine plants, air intakes or fuel supply control of air-breathing jet-propulsion plants

F02C 7/00, F02C 9/00

Informative references

Attention is drawn to the following places, which may be of interest for search:

Arrangement or mounting of jet-propulsion plants in land vehicles or vehicles in general

B60K

Arrangement or mounting of jet-propulsion plants in waterborne vessels

B63H

Controlling aircraft attitude, flight direction or altitude by jet reaction

B64C 15/00

Arrangement or mounting of jet-propulsion plants in aircraft

B64D

Plants characterised by the power of the working fluid being divided between jet propulsion and another form of propulsion, e.g. propeller

F02B 61/00, F02C 6/20

Special rules of classification

In this subclass the Indexing Code scheme F05D is used as follows:

F05D 2200/00 Mathematical features

F05D 2210/00 Working fluid

F05D 2220/00 Application

F05D 2230/00 Manufacture

F05D 2240/00 Components

F05D 2250/00 Geometry

F05D 2260/00 Function

F05D 2300/00 Materials

Glossary of terms

In this place, the following terms or expressions are used with the meaning indicated:

Jet-propulsion plants

means plants using combustion to produce a fluid stream from which a propulsive thrust on the plant is obtained on the reaction principle

Jet pipe

means the exhaust duct of a jet engine that carries the exhaust to the nozzle

Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto (rocket nozzles F02K 9/97)
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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References
Limiting references

This place does not cover:

Rocket nozzles

F02K 9/97

{with means to modify the direction of thrust vector (F02K 1/54 takes precedence; thrust vectoring of rockets F02K 9/80)}
References
Limiting references

This place does not cover:

Nozzles having means for reversing jet thrust

F02K 1/54

Thrust vectoring of rockets

F02K 9/80

Informative references

Attention is drawn to the following places, which may be of interest for search:

Aerodynamic vectoring surfaces

B64C

{by using one or more swivable nozzles rotating about their own axis}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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{within one plane only}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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{in any rearward direction}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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Mounting of an exhaust cone in the jet pipe
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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by axially moving or transversely deforming an internal member, e.g. the exhaust cone
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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{by transversely deforming an internal member}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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by axially moving an external member, e.g. a shroud (F02K 1/12 takes precedence)
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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References
Limiting references

This place does not cover:

Varying effective area of jet pip or nozzle by means of pivoted flaps

F02K 1/12

by distorting the jet pipe or nozzle
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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by means of pivoted eyelids
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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{of one series of flaps hinged at their upstream ends on a fixed structure (F02K 1/1215 - F02K 1/1292 take precedence)}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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References
Limiting references

This place does not cover:

Two or more series of flaps; One moveable series of flaps hinged to upstream axially moveable structure

F02K 1/1215 -F02K 1/1292

{of two series of flaps, the upstream series having its flaps hinged at their upstream ends on a fixed structure, and the downstream series having its flaps hinged at their downstream ends on a fixed structure}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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{of two series of flaps, the upstream series having its flaps hinged at their upstream ends on a fixed structure and the downstream series having its flaps hinged at their upstream ends on the downstream ends of the flaps of the upstream series}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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{of two series of flaps, both having their flaps hinged at their upstream ends on a fixed structure}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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{of two series of flaps, the upstream series having its flaps hinged at their upstream ends on a fixed structure and the downstream series having its flaps hinged at their upstream ends on a substantially axially movable structure}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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{of two series of flaps, the upstream series having its flaps hinged at their upstream ends on a fixed structure and the downstream series having its flaps hinged at their downstream ends on a substantially axially movable structure}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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{of one series of flaps hinged at their upstream ends on a substantially axially movable structure}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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{of three series of flaps, the upstream series having its flaps hinged at their upstream ends on a fixed structure and the internal downstream series having its flaps hinged at their downstream ends on the downstream ends of the flaps of the external downstream series hinged on a fixed structure at their upstream ends}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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having an ejector
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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Nozzles having means for dividing the jet into a plurality of partial jets or having an elongated cross-section outlet
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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the means being movable into an inoperative position
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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Nozzles having means, e.g. a shield, reducing sound radiation in a specified direction (F02K 1/40 takes precedence)
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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References
Limiting references

This place does not cover:

Nozzles having means for dividing the jet into a plurality of partial jets or having an elongated cross-section outlet

F02K 1/40

Nozzles having means for adding air to the jet or for augmenting the mixing region between the jet and the ambient air, e.g. for silencing (F02K 1/28, F02K 1/36, F02K 1/38 take precedence)
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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References
Limiting references

This place does not cover:

Using fluid jets to influence the jet flow

F02K 1/28

Having an ejector

F02K 1/36

Introducing air inside the jet

F02K 1/38

Corrugated nozzles
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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Deflecting outwardly a portion of the jet by retractable scoop-like baffles
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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Nozzles specially constructed for positioning adjacent to another nozzle or to a fixed member, e.g. fairing
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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{in specified direction, e.g. to obviate its reinjection}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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{by blocking the rearward discharge by means of a translatable member}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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Reversers mounted on the inner cone or the nozzle housing {or the fuselage}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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by blocking the rearward discharge by means of pivoted eyelids or clamshells, e.g. target-type reversers
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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{the aft end of the engine cowling being movable to uncover openings for the reversed flow}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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by blocking the rearward discharge by means of flaps
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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{the aft end of the engine cowling being movable to uncover openings for the reversed flow}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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{using inflatable diaphragms}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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using reversing fan blades
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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Reversers mounted on the engine housing downstream of the fan exhaust section
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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using thrust reverser flaps or doors mounted on the fan housing
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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the aft end of the fan housing being movable to uncover openings in the fan housing for the reversed flow
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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Control or regulation of thrust reversers
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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{with actuating systems or actuating devices; Arrangement of actuators for thrust reversers}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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{with blocking systems or locking devices; Arrangement of locking devices for thrust reversers}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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Other construction of jet pipes
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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Couplings or connections
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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{Sealing devices therefor, e.g. for movable parts of jet pipes or nozzle flaps}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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Jet pipe walls, e.g. liners
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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{Heat insulating structures or liners, cooling arrangements, e.g. post combustion liners; Infrared radiation suppressors}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Wall structures in combustion chambers

F23R 3/002

{Infrared radiation suppressors}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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{Sound absorbing structures or liners}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Noise suppression in air intakes

F02C 7/045

Noise attenuators in general

G10K 11/00

Plants including a gas turbine driving a compressor or a ducted fan
Definition statement

This place covers:

Mainly ducted gas turbine plants with ducted fans, whereby the main flow which is only slightly compressed by a fan or the like bypasses the core engine; Heating of the bypass flow; Afterburners.

Illustrative example of subject matter classified in this group.

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with counter-rotating {, e.g. fan} rotors
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Turbomachines with counter-rotating rotors

F01D 1/24

Gas turbines having counter-rotating rotors

F02C 3/067

Axial flow pumps for elastic fluids with counter-rotating parts

F04D 19/024

with supplementary heating of the working fluid; Control thereof (control of fuel supply therefor F02C 9/26)
Definition statement

This place covers:

Heating of the working fluid, e.g. main working fluid or bypass flow, by heat exchangers or burners. These include after-burners.

Illustrative example of subject matter classified in this group.

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References
Limiting references

This place does not cover:

Control of fuel supply therefor

F02C 9/26

Informative references

Attention is drawn to the following places, which may be of interest for search:

After-burners, combustion chambers

F23R

Plants including an engine, other than a gas turbine, driving a compressor or a ducted fan
Definition statement

This place covers:

Plants including an engine, other than a gas turbine, driving a compressor or a ducted fan.

Illustrative example of subject matter classified in this group.

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Plants in which the working fluid is used in a jet only, i.e. the plants not having a turbine or other engine driving a compressor or a ducted fan; Control thereof (rocket-engine plants F02K 9/00)
References
Limiting references

This place does not cover:

Rocket- engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof

F02K 9/00

Synonyms and Keywords

In patent documents, the following abbreviations are often used:

Ram jet

Compression of the working fluid caused by the engine's forward motion without a rotary compressor

Scram jet

Supersonic combustion ram jet

{the engine comprising a rotor rotating under the actions of jets issuing from this rotor}
Definition statement

This place covers:

Rotating rotors rotating due to the reaction force of the jets issued from the rotor.

Illustrative example of subject matter classified in this group.

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References
Informative references

Attention is drawn to the following places, which may be of interest for search:

With pressure velocity transformation exclusively in rotor, e.g. the rotor rotating under the influence of jets issuing from the rotor

F01D 1/32

Rotating combustion chamber with the working fluid being a combustion product

F02C 3/165

Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
Definition statement

This place covers:

Rocket-engine plant related aspects such as solid and liquid propellant rocket plants; Constructional details of the charges; Supply and feeding of propellant; Starting and restarting.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Cosmonautic vehicles

B64G 1/00

Chemical composition of propellants

C06B, C06D

Launching apparatus for rockets

F41F 3/04

Explosive charges, ammunition

F42B

using solid propellants (F02K 9/72 takes precedence; using semi-solid or pulverulent propellants F02K 9/70)
Definition statement

This place covers:

Solid propellant rocket plants.

Illustrative example of subject matter classified in this group.

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References
Limiting references

This place does not cover:

Using semi-solid or pulverulent propellants

F02K 9/70

Using liquid and solid propellants, i.e. hybrid rocket-engine plants

F02K 9/72

Informative references

Attention is drawn to the following places, which may be of interest for search:

Explosives or thermic compositions; Manufacture thereof; Use of single substances as explosives

C06B

Means for generating smoke or mist; Gas-attack compositions; Generation of gas for blasting or propulsion (Chemical part)

C06D

Cartridges for producing gas under pressure

F42B 3/04

Constructional parts; Details not otherwise provided for
Definition statement

This place covers:

Solid propellant construction parts and details including: casings, liners, joints, seals, propellant supports, safety devices, and cooling arrangements.

Illustrative example of subject matter classified in this group.

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References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Shape or structure of solid propellant charges

F02K 9/10

Starting or ignition means or arrangements

F02K 9/95

Rocket nozzles

F02K 9/97

{Propellants}
Definition statement

This place covers:

Specific types of liquid or gaseous propellants, e.g. hypergolic propellants, methane, hydrogen peroxide.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Explosives or thermic compositions; Manufacture thereof; Use of single substance as explosive

C06B

Means for generating smoke or mist; Gas-attack compositions; Generation of gas blasting or propulsion (Chemical part)

C06D

using pumps
Definition statement

This place covers:

Feeding propellants by the use of pumps, e.g. turbo-pumps.

Illustrative example of subject matter classified in this group.

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References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Control of propellant feed pumps

F02K 9/563

Pumps per se

F04

Injectors
Definition statement

This place covers:

Injectors for liquid or gaseous propellants.

Illustrative example of subject matter classified in this group.

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References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Spraying or atomising in general

B05B

Leakage detectors; Purging systems; Filtration systems
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Filters per se

B01D

Propellant feed valves
Definition statement

This place covers:

Control of rocket propellant feed valves.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Valves in general

F16K

Constructional parts; Details not otherwise provided for
Definition statement

This place covers:

Constructional parts or details of liquid or gaseous propellant rockets such as reservoirs, combustion chambers, decomposition chambers.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Starting or ignition means or arrangements

F02K 9/95

Rocket nozzles

F02K 9/97