Cooperative Patent Classification

CPC Definition - Subclass F27D

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Last Updated Version: 2016.11
DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE (combustion apparatus F23)
Definition statement

This place covers:

Details, accessories of furnaces, kilns or ovens in general, not for specific furnaces, kilns or ovens

Relationships with other classification places

The details or accessories for specific furnaces, kilns or ovens are classified in F27B subgroups

Special rules of classification

Indexing Codes should be used as additional information or in case an CPC symbol is given and more detailed Indexing Codes are existing, these more detailed Indexing Codes should also be given.

Casings; Linings; Walls; Roofs (refractory materials C04B; firebridges for combustion chambers F23M 3/00)
References
Informative references

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

Linings for casting-melt holding vessels

Clay-wares and shaped ceramic products

Walls, e.g. partitions, for buildings

Protection of pipes or pipe fittings; thermal insulation in general

Shape of bricks or blocks used in combustion chambers

{Linings or walls comprising heat shields, e.g. heat shieldsd (shields protecting the charge F27D 5/00)}
References
Informative references

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

Shields protecting the charge

Crowns; Roofs
References
Informative references

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

Crowns and roofs in combustion chambers

Monolithic linings; Supports therefor
References
Informative references

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

Supports for linings

Heat-exchange apparatus

Supports for linings (F27D 1/10 takes precedence)
References
Limiting references

This place does not cover:

Supports for monolithic linings

Making or repairing linings {increasing the durability of linings or breaking away linings}
References
Informative references

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

Equipment used for making or repairing linings, e.g. by flame gunning

Charging; Discharging; Manipulation of charge (moving charge through a furnace F27B 9/14)
References
Informative references

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

Charging of the electric furnace

Moving charge through furnace

{of metallic workpieces}
References
Informative references

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

Charging, discharging and manipulation of charges in heat treatment furnaces, e.g. with rolls

{transport or conveyor rolls for furnaces; roller rails (conveyor rolls in general B65G)}
References
Informative references

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

Rollers in rolling mills

Rolls in continuous casting

Conveyor rolls in general

Roller conveyors for transporting glass sheets

Screw feeders; Screw dischargers
References
Informative references

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

Screw conveyors in general processes

Screw conveyors in general

Tapping equipment; Equipment for removing {or retaining} slag
References
Informative references

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

Closure equipment in casting melt-holding vessels

Tap-holes and repairing top-holes in steel making converters

{Taphole forming equipment, e.g. boring machines, piercing tools}
References
Informative references

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

Opening or sealing the tap-hole of blast furnaces

Introducing a fluid jet or current into the charge {(porous elements for gas flushing of molten metals B22D 1/005)}
References
Informative references

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

Injection assemblies for treating melt in ladles or runners before casting

Injection of gases into liquid metals in ladles

Devices for accelerating or decelerating flow of the materials

Tuyeres for blast furnaces

Bottoms or tuyeres for converters

Burners or injectors for injecting pulverulent materials into the furnace

Treating molten ferrous alloy by injecting powdered material

Charging particulate material using a fluid carrier
References
Informative references

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

Lances or injectors for steel production in converters

Burners or injectors for injecting gas

Supports, screens, or the like for the charge within the furnace (travelling or movable supports F27D 3/12)
References
Informative references

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

Travelling or movable supports

Setting, e.g. drying, dehydrating or firing ceramic articles

Supports, baskets, containers or covers for heat treatment

Details of grates for burning waste materials

Elements for supporting goods to be dried

{Treatment baskets for ceramic articles (for metallic articles C21D 9/0025)}
References
Informative references

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

Treatment baskets for metallic articles

{Shields for the charge (shields for the lining F27D 1/0033)}
References
Informative references

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

Shields for the lining

Forming, maintaining, or circulating atmospheres in heating chambers
References
Informative references

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

General devices for heat treatment with forced gas circulation; under reduced pressure or vacuum

Arrangement of elements for electric heating in or on furnaces (electric heating per se H05B)
References
Informative references

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

Electric heating in general

Ohmic resistance heating
References
Informative references

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

Ohmic resistance heating in general and specially adapted for furnaces

Disposition of electrodes (automatic control of temperature G05D 23/00; electric discharge apparatus H01T; arrangements for feeding or guiding electrodes H05B 7/10; automatic control of power by positioning of electrodes H05B 7/144)
References
Informative references

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

Control of temperature

Arrangements of feeding or guiding electrodes

Automatic control of power by positioning of electrodes

{Preheating scrap (preheating of scrap for steel making C21C 5/565)}
References
Informative references

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

Preheating of scrap for steel production

{comprising a cooling grate}
Definition statement

This place covers:

Cooling of discharged material comprising a cooling grate.

References
Informative references

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

Conveyors in general comprising a cyclically-moving

Heat-exchange apparatus, whereby particulate material forming a bed, e.g. fluidised, on vibratory sieves

{Extraction of waste gases, collection of fumes and hoods used therefor (in general B08B 15/00)}
References
Informative references

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

Preventing escape of dirt or fumes from the area where they are produced

Removal of waste gases or dust coming from steel making converters

{of waste gases emanating from an electric arc furnace}
References
Informative references

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

Working up flue dust

Arrangements of controlling devices
References
Informative references

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

Arrangement of controlling devices in shaft furnaces

Arrangement of controlling devices in hearth type furnaces

Arrangement of controlling devices in muffle furnaces

Arrangement of controlling devices in rotary drum furnaces

Arrangement of controlling devices in tunnel furnaces

Arrangement of controlling devices in ring type furnaces

Arrangement of controlling devices in crucible or pot furnaces

Arrangement of controlling devices in fluidized bed furnaces

Arrangements of monitoring devices; Arrangements of safety devices
References
Informative references

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

Test rods or other checking devices in blast furnaces

Measuring and sampling devices in steel making converters

Arrangement of monitoring devices in shaft furnaces

Arrangement of monitoring devices in hearth type furnaces

Arrangement of monitoring devices in muffle furnaces

Arrangement of monitoring devices in rotary drum furnaces

Arrangement of monitoring devices in tunnel furnaces

Arrangement of monitoring devices in ring type furnaces

Arrangement of monitoring devices in crucible or pot furnaces

Arrangement of monitoring devices in fluidized bed furnaces

Measuring temperature and heat quantity in general

{comprising breaking tools, e.g. hammers, drills, scrapers (breaking away linings F27D 1/1694; boring machines for forming tapholes F27D 3/1527)}
Definition statement

This place covers:

Devices for removing incrustations, e.g. slag, metal deposits, dust,

comprising breaking tools like hammers, drills, scrapers;

References
Informative references

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

Breaking away linings

Boring machines for forming tap-holes

Stirring devices for molten material (F27D 3/14 takes precedence)
References
Informative references

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

Mixers in general

Refining metals including stirring

Electrodynamics pumps

Subject matter not provided for in other groups of this subclass
Definition statement

This place covers:

Details or accessories not covered by any preceding group

{Electric heating elements or system}
References
Informative references

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

Electric heating in general

{using burners (manufacture of steel in an electric arc furnace equipped with burners C21C 5/5217)}
References
Informative references

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

Burners for combustion of gas in general

F27D14/00 - F27D14/84

Burners used for glass melting

Manufacture of steel in electric arc furnaces equipped with burners

Burners in combustion in general