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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; gas-turbine combustion chambers F23R; using gas turbines in compression refrigeration plants F25B 11/00; using gas-turbine plants in vehicles, see the relevant vehicle classes)
Definition statement
This subclass/group 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 relevant to classification in this subclass
This subclass/group does not cover:
Construction of turbines
Jet-propulsion plants
Construction of compressors or fans
Gas-turbine combustion chambers
Using gas turbines in compression refrigeration plants
Steam turbine plants
Special vapour plants
Special rules of classification within this subclass

In this subclass the Indexing Code scheme R05D 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 product F02C 3/00, F02C 5/00)
Definition statement
This subclass/group 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.

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
Gas-turbine plants characterised by the use of combustion products as the working fluid (generated by intermittent combustion F02C 5/00)
Informative references
Attention is drawn to the following places, which may be of interest for search:
The working fluid being generated by intermittent combustion
Gas-turbine plants characterised by the working fluid being generated by intermittent combustion
Definition statement
This subclass/group 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} )
Informative references
Attention is drawn to the following places, which may be of interest for search:
If related to a fluidised-bed combustor
If waste heat from the gas turbine and usage thereof is concerned
Special rules of classification within this group

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 within this group

Illustrative example of subject matter classified in F02C 6/06

media2.png

taken from US3216712

the gas being bled from the gas-turbine compressor
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
Special rules of classification within this group

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 within this group

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 subclass/group covers:

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

media5.png

taken from US2006016196

References relevant to classification in this group
This subclass/group does not cover:
Seals
Variable geometry turbines
Bearings
Lubrication
Casings
Special rules of classification within this group

Use F05D 2220/40 for classifying additional information

Glossary of terms
In this subclass/group, 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)
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
Using waste heat as source of energy for refrigeration plants
Special rules of classification within this group

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 subclass/group, 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 to F02C 6/00; Air intakes for jet-propulsion plants (controlling F02C 9/00)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Controlling or regulation of gas turbine plants
having provisions for obviating the penetration of damaging objects or particles
Relationship between large subject matter areas

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

Fuel supply systems
References relevant to classification in this group
This subclass/group does not cover:
Injectors, mixing or premixing devices
Heating fuel before feeding to the burner
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group: US6105370

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Relationship between large subject matter areas

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 within this group

Illustrative example of subject matter classified in F02C 7/268

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taken from EP1382802

Fluid drives (turbine starters F02C 7/277)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Turbine starters
Special rules of classification within this group

Illustrative example of subject matter classified in F02C 7/27

media8.png

Taken from EP1298298

generated by cartridges
Special rules of classification within this group

Illustrative example of subject matter classified in F02C 7/272

media9.png

Taken from GB889105

Mechanical drives
Special rules of classification within this group

Illustrative example of subject matter classified in F02C 7/275

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taken from EP1811132

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

Illustrative example of subject matter classified in F02C 7/277

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taken from US2001028845

Arrangement of seals
Definition statement
This subclass/group covers:

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

media12.jpg

taken from US2010284782

Relationship between large subject matter areas

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 relevant to classification in this group
This subclass/group does not cover:

If related to blade treatment F01D 5/286

Arrangement, mounting, or driving, of auxiliaries
Relationship between large subject matter areas
Gearboxes
Glossary of terms
In this subclass/group, 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 subclass/group covers:

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

Relationship between large subject matter areas

Controlling air intakes; F02C 7/057

Controlling compressors; F04D 27/00

Monitoring of gas turbines/performance monitoring; G05B, G05D

Informative references
Attention is drawn to the following places, which may be of interest for search:
Modelling of gas turbines
This page is owned by Office of Patent Classification.
Last Modified: 10/11/2013