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Indent Level
Color Curly Brackets (indicating CPC extensions to IPC) References Date Revised
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CPC
COOPERATIVE PATENT CLASSIFICATION
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METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL (for combustion of fuels that are solid at room temperatures, but burned in melted form, e.g. candle wax, C11C 5/00, F23C, F23D ; using solid fuel suspended in air F23C, F23D 1/00 ; using solid fuel suspended in liquids F23C, F23D 11/00; using solid fuel and fluent fuel simultaneously or alternately F23C, F23D 17/00; burning of low grade fuel F23G; grates F23H; feeding solid fuel to combustion apparatus F23K; combustion chambers, not otherwise provided for F23M; domestic apparatus F24; central heating boilers F24D; package boilers F24H) [2013‑01]
NOTE

  • This subclass is only concerned with the combustion of lump fuel, or of pulverulent or granulated fuel if no use is made of its fluent nature.
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Guidance heading:
IPC7 groups [2013‑01]
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Combustion apparatus using only lump fuel [2013‑01]
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F23B 1/02
.
for indirect heating of a medium in a vessel, e.g. for boiling water (steam generation F22) [2013‑01]
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F23B 1/04
. .
External furnaces, i.e. with furnace in front of the vessel [2013‑01]
F23B 1/06
. . .
for heating water-tube boilers, e.g. Tenbrink flue furnaces [2013‑01]
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F23B 1/08
. .
Internal furnaces, i.e. with furnaces inside the vessel [2013‑01]
F23B 1/10
. . .
for heating locomotive boilers [2013‑01]
F23B 1/12
. .
with a plurality of combustion chambers [2013‑01]
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F23B 1/16
.
the combustion apparatus being modified according to the form of grate or other fuel support
{
(for incinerators F23G 5/002)
}
[2013‑01]
F23B 1/165
. .
{
using roller grate
}
[2013‑01]
F23B 1/18
. .
using inclined grate [2013‑01]
F23B 1/20
. .
using step-type grate [2013‑01]
F23B 1/22
. .
using travelling grate [2013‑01]
F23B 1/24
. .
using rotating grate [2013‑01]
F23B 1/26
. .
using imperforate fuel supports [2013‑01]
F23B 1/28
. .
using ridge-type grate, e.g. for combustion of peat, sawdust, or pulverulent fuel
{
(combustion of peat, sawdust F23G 7/10)
}
[2013‑01]
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F23B 1/30
.
characterised by the form of combustion chamber [2013‑01]
F23B 1/32
. .
rotating [2013‑01]
F23B 1/34
. .
annular [2013‑01]
F23B 1/36
. .
shaft-type [2013‑01]
F23B 1/38
. .
for combustion of peat, sawdust, or pulverulent fuel on a grate or other fuel support
{
(combustion of peat, sawdust F23G 7/10)
}
[2013‑01]
F23B 3/00
Combustion apparatus which is portable or removable with respect to the boiler or other apparatus which is heated [2013‑01]
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Combustion apparatus with arrangements for burning uncombusted material from primary combustion
{
(combustion apparatus characterised by the combination of two or more combustion chambers F23C 6/00; the primary combustion being pulverulent fuel F23C 9/003)
}
[2013‑01]
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F23B 5/02
.
in main combustion chamber [2013‑01]
F23B 5/025
. .
{
recirculating uncombusted solids to combustion chamber
}
[2013‑01]
F23B 5/04
.
in separate combustion chamber; on separate grate [2013‑01]
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Combustion techniques; Other solid-fuel combustion apparatus [2013‑01]
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F23B 7/002
.
{
characterised by gas flow arrangements
}
[2013‑01]
F23B 7/005
. .
{
with downdraught through fuel bed and grate
}
[2013‑01]
F23B 7/007
. .
{
with fluegas recirculation to combustion chamber
}
[2013‑01]

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Combustion apparatus characterised by the combination of two or more combustion chambers [2013‑01]
F23B 10/02
.
including separate secondary combustion chambers [2013‑01]
WARNING

F23B 20/00
Combustion apparatus specially adapted for portability or transportability [2013‑01]
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Combustion apparatus with driven means for agitating the burning fuel; Combustion apparatus with driven means for advancing the burning fuel through the combustion chamber [2013‑01]
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F23B 30/02
.
with movable, e.g. vibratable, fuel-supporting surfaces; with fuel-supporting surfaces that have movable parts [2013‑01]
F23B 30/04
. .
with fuel-supporting surfaces that are rotatable around a horizontal or inclined axis and support the fuel on their inside, e.g. cylindrical grates [2013‑01]
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F23B 30/06
. .
with fuel supporting surfaces that are specially adapted for advancing fuel throught the combustion zone [2013‑01]
F23B 30/08
. . .
with fuel-supporting surfaces that move through the combustion zone, e.g. with chain grates [2013‑01]
F23B 30/10
. . .
with fuel-supporting surfaces having fuel advancing elements that are movable, but remain essentially in the same place, e.g. with rollers or reciprocating grate bars [2013‑01]
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Combustion apparatus with driven means for feeding fuel into the combustion chamber [2013‑01]
F23B 40/02
.
the fuel being fed by scattering over the fuel-supporting surface [2013‑01]
F23B 40/04
.
the fuel being fed from below through an opening in the fuel-supporting surface [2013‑01]
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F23B 40/06
.
the fuel being fed along the fuel-supporting surface [2013‑01]
F23B 40/08
. .
into pot- or through-shaped grates [2013‑01]
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Combustion apparatus in which the fuel is fed into or through the combustion zone by gravity, e.g. from a fuel storage situated above the combustion zone [2013‑01]
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F23B 50/02
.
the fuel forming a column, stack or thick layer with the combustion zone at its bottom [2013‑01]
F23B 50/04
. .
the movement of combustion air and flue gases being substantially transverse to the movement of the fuel [2013‑01]
F23B 50/06
. .
the fuel gases being removed downwards through one or more openings in the fuel-supporting surface [2013‑01]
F23B 50/08
. .
with fuel-deflecting bodies forming free combustion spaces inside the fuel layer [2013‑01]
F23B 50/10
. .
with the combustion zone at the bottom of fuel-filled conduits ending at the surface of a fuel bed [2013‑01]
F23B 50/12
.
the fuel being fed to the combustion zone by free fall or by sliding along inclined surfaces, e.g. from a conveyer terminating above the fuel bed [2013‑01]
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Combustion apparatus in which the fuel burns essentially without moving [2013‑01]
F23B 60/02
.
with combustion air supplied through a grate [2013‑01]
F23B 70/00
Combustion apparatus characterised by means returning solid combustion residues to the combustion chamber [2013‑01]
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Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel [2013‑01]
F23B 80/02
.
by means for returning flue gases to the combustion chamber or to the combustion zone [2013‑01]
F23B 80/04
.
by means for guiding the flow of flue gases, e.g. baffles [2013‑01]
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Combustion methods not related to a particular type of apparatus [2013‑01]
NOTE

WARNING

F23B 90/02
.
Start-up techniques [2013‑01]
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.
including secondary combustion (in separate combustion chambers F23B 10/02) [2013‑01]
F23B 90/06
. .
the primary combustion being a gasification or pyrolysis in a reductive atmosphere [2013‑01]
F23B 90/08
. .
in the presence of catalytic material [2013‑01]
F23B 99/00
Subject matter not provided for in other groups of this subclass [2013‑01]
F23B 2101/00
Adaptation of combustion apparatus to boilers in which the combustion chamber is situated inside the boiler vessel, e.g. surrounded by cooled surfaces [2013‑01]
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Guidance heading:
Indexing scheme related to adaptation of combustion apparatus to boilers [2013‑01]
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F23B 2103/00
Adaptation of combustion apparatus for placement in or against an opening of a boiler, e.g. for replacing an oil burner [2013‑01]
F23B 2103/02
.
for producing an essentially horizontal flame [2013‑01]
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F23B 2700/00
Combustion apparatus for solid fuel [2013‑01]
F23B 2700/003
.
adapted for use in water-tube boilers [2013‑01]
F23B 2700/004
.
adapted for use in Tenbrink boilers [2013‑01]
F23B 2700/005
.
adapted for use in locomotives [2013‑01]
F23B 2700/006
.
Details of locomotive combustion apparatus [2013‑01]
F23B 2700/007
.
with pressurised combustion chambers [2013‑01]
F23B 2700/008
.
with interchangeable combustion chambers [2013‑01]
F23B 2700/009
.
adapted for use in various steam boilers [2013‑01]
F23B 2700/01
.
adapted for boilers built up from sections [2013‑01]
F23B 2700/011
.
with fuel shaft for steam boilers [2013‑01]
F23B 2700/012
.
with predrying in fuel suply area [2013‑01]
F23B 2700/013
.
for use in baking ovens or cooking vessels [2013‑01]
F23B 2700/014
.
for use in reverberatory furnaces [2013‑01]
F23B 2700/018
.
with fume afterburning by staged combustion [2013‑01]
F23B 2700/022
.
with various types of fume afterburners [2013‑01]
F23B 2700/023
.
with various arrangements not otherwise provided for [2013‑01]
F23B 2700/037
.
Burners for solid or solidified fuel, e.g. metaldehyde blocks [2013‑01]

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F23B 2900/00
Special features of, or arrangements for combustion apparatus using solid fuels; Combustion processes therefor [2013‑01]
F23B 2900/00001
.
Combustion chambers with integrated fuel hopper [2013‑01]
F23B 2900/00003
.
Combustion devices specially adapted for burning metal fuels, e.g. Al or Mg [2013‑01]
F23B 2900/00004
.
Means for generating pulsating combustion of solid fuel [2013‑01]
F23B 2900/00005
.
Means for applying acoustical energy to flame [2013‑01]
F23B 2900/00006
.
Means for applying electricity to flame, e.g. an electric field [2013‑01]
F23B 2900/99001
.
Retrofitting or converting solid fuel stoves to gas or liquid fuels [2013‑01]
This page is owned by Office of Patent Classification.
Last Modified: 10/10/2013