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CPC Definition - Subclass F02C

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Last Updated Version: 2024.01
F02C
GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B 11/00)
Definition statement

This place covers:

  • Combustion product or hot gas turbine plants.
  • Internal combustion turbines or turbine plants.
  • Turbine plants in which the working fluid is an unheated, pressurised gas.
References
Limiting references

This place does not cover:

Construction of turbines

F01D

Steam turbine plants

F01K

Special vapour plants

F01K

Jet-propulsion plants

F02K

Construction of compressors or fans

F04D

Gas-turbine combustion chambers

F23R

Using gas turbines in compression refrigeration plants

F25B 11/00

Special rules of classification

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

Gas-turbine plants characterised by the use of hot gases or unheated pressurised gases, as the working fluid (by the use of combustion products F02C 3/00, F02C 5/00)
Definition statement

This place covers:

Gas-turbine plants characterised by the use of hot gases or unheated pressurised gases, as the working fluid, e.g. heated indirectly by solar power, nuclear power or the like; unheated pressurized gas that is stored and prior to use the expansion of the pressurized gas is used to drive a turbine.

References
Informative references

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

Gas-turbine plants characterized by the use of combustion products

F02C 3/00, F02C 5/00

Gas-turbine plants characterised by the use of combustion products as the working fluid (generated by intermittent combustion F02C 5/00)
References
Informative references

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

The working fluid being generated by intermittent combustion

F02C 5/00

Gas-turbine plants characterised by the working fluid being generated by intermittent combustion
Definition statement

This place covers:

Gas-turbine plants characterised by the working fluid being generated by intermittent combustion, i.e. non continuous combustion e.g. in a combustion chamber having valves

media0.png

taken from FR2210718

Gas-turbine plants providing heated or pressurised working fluid for other apparatus, e.g. without mechanical power output (F02C 6/18 takes precedence {; for a fluidised-bed combustor F02C 3/205})
References
Informative references

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

If related to a fluidised-bed combustor

F02C 3/205

If waste heat from the gas turbine and usage thereof is concerned

F02C 6/18

Special rules of classification

Illustrative example of subject matter classified in F02C 6/04

media1.png

taken from US2003012997

If recovery of waste heat from the gas turbine to a second process or plant is concerned, classify only in F02C 6/18, which takes precedence.

providing compressed gas (F02C 6/10 takes precedence)
Special rules of classification

Illustrative example of subject matter classified in F02C 6/06

media2.png

taken from US3216712

the gas being bled from the gas-turbine compressor
References
Informative references

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

For controlling of working fluid flow by bleeding or bypassing

F02C 9/18

Special rules of classification

Illustrative example of subject matter classified in F02C 6/08

media3.png

taken from US5203162

supplying working fluid to a user, e.g. a chemical process, which returns working fluid to a turbine of the plant
Special rules of classification

Illustrative example of subject matter classified in F02C 6/10

media4.png

Taken from EP568431

Turbochargers, i.e. plants for augmenting mechanical power output of internal-combustion piston engines by increase of charge pressure
Definition statement

This place covers:

Either turbochargers and details thereof if not covered elsewhere or plants/cycles with supercharging apparatuses or processes

media5.png

taken from US2006016196

References
Limiting references

This place does not cover:

Seals

F01D 11/00

Variable geometry turbines

F01D 17/14, F01D 17/16

Bearings

F01D 25/16

Lubrication

F01D 25/18

Casings

F01D 25/24

Special rules of classification

Use F05D 2220/40 for classifying additional information

Glossary of terms

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

VGT

variable turbine geometry

using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants (using waste heat as source of energy for refrigeration plants F25B 27/02; using the waste heat of a gasturbine for steam generation or in a steam cycle see F01K 23/10)
References
Informative references

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

Using the waste heat of a gasturbine for steam generation or in a steam cycle

F01K 23/10

Using waste heat as source of energy for refrigeration plants

F25B 27/02

Special rules of classification

Do not classify here if gas turbine is just an otherwise unspecific feature of a HRSG system, consider F01K and subgroups instead

Glossary of terms

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

HRSG

heat recovery steam generator

Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C 1/00 - F02C 6/00; Air intakes for jet-propulsion plants (controlling F02C 9/00)
References
Informative references

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

Controlling or regulation of gas turbine plants

F02C 9/00

having provisions for obviating the penetration of damaging objects or particles
Relationships with other classification places

Separation of particles from gases in general: B01D 45/00

Fuel supply systems
References
Limiting references

This place does not cover:

Injectors, mixing or premixing devices

F23D 14/00

Heating fuel before feeding to the burner
Definition statement

This place covers:

Illustrative example of subject matter classified in this group: US6105370

media6.png

Relationships with other classification places

Relates to F02C 7/08, F02C 7/10 and F02C 7/105 or F02C 7/12, i.e. cooling potential of the fuel is used for cooling purposes in other parts of the engine;

Starting drives for the rotor {, acting directly on the rotor of the gas turbine to be started}
Special rules of classification

Illustrative example of subject matter classified in F02C 7/268

media7.png

taken from EP1382802

Fluid drives (turbine starters F02C 7/277)
References
Informative references

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

Turbine starters

F02C 7/277

Special rules of classification

Illustrative example of subject matter classified in F02C 7/27

media8.png

Taken from EP1298298

generated by cartridges
Special rules of classification

Illustrative example of subject matter classified in F02C 7/272

media9.png

Taken from GB889105

Mechanical drives
Special rules of classification

Illustrative example of subject matter classified in F02C 7/275

media10.png

taken from EP1811132

the starter being a {separate} turbine
Special rules of classification

Illustrative example of subject matter classified in F02C 7/277

media11.png

taken from US2001028845

Arrangement of seals
Definition statement

This place covers:

Arrangement of seals in a gas or steam turbine in a macroscopic sense

media12.jpg

taken from US2010284782

Relationships with other classification places

For details of seals in gas turbine applications: F01D 11/00.

Sealing in general: F16J.

Preventing corrosion {or unwanted deposits} in gas-swept spaces
References
Limiting references

This place does not cover:

If related to blade treatment

F01D 5/286

Arrangement, mounting, or driving, of auxiliaries
Relationships with other classification places

Gearboxes

F16H

Glossary of terms

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

PTO

Power Take Off

Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants (controlling air intakes F02C 7/057; controlling turbines F01D; controlling compressors F04D 27/00; controlling in general G05)
Definition statement

This place covers:

Controlling gas-turbine plants, controlling fuel supply in air- breathing jet-propulsion plants

Relationships with other classification places

Controlling air intakes; F02C 7/057

Controlling compressors; F04D 27/00

Monitoring of gas turbines/performance monitoring; G05B, G05D

References
Informative references

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

Modelling of gas turbines

G05B 17/00