IPC Revision WG – Definition Project
Project: D 273
Subclass: F23M
Rapporteur Proposal
Date : July 2, 2013
Title Casings, linings, walls or doors specially adapted for combustion chambers,
e.g. firebridges;
Devices for deflecting air, flames or combustion products in combustion
chambers;
Safety arrangements specially adapted for combustion apparatus;
Details of combustion chambers, not otherwise provided for
Glossary of terms
In this subclass, the following terms (or expressions) are used with the meaning indicated:
Air
Combustion
Combustion chamber
Firebridge
a mixture of gases containing free oxygen and able to
promote or support combustion
a heat-producing sequence of chemical reactions
between a burnable substance and molecular oxygen,
e.g. in air, in most cases generating light in the form of
flames or a glow
a chamber in which fuel is burned to establish a selfsupporting fire or flame and which surrounds that fire or
flame
a low wall separating the fuel bed from adjacent flue
gas passages in apparatus for combustion of solid fuel,
for example in reverberatory furnaces or fire-tube
boilers
IPC Revision WG – Definition Project
Project: D 273
Subclass: F23M 5/00
Rapporteur Proposal
Date : July 2, 2013
Title Casings;
Linings;
Walls
Relationship between large subject matter areas
Combustion apparatus:
This group is a detail place in relation to subclasses F23B, F23C, F23G and F23R, which
cover complete apparatus. Arrangements that affect the overall design of a combustion
apparatus should be classified in those subclasses.
Application places for combustion apparatus:
Some wall constructions should be considered as special adaptations to special types of
combustion apparatus and therefore classified in the places for these types. Examples of such
places can be found under the heading "References relevant to classification in this subclass"
below.
Places for construction in general:
This group covers special adaptations of casings, linings or walls for specific requirements of
combustion chambers, for example relating to resistance to heat or flames, heat insulation or
adaptation to the layout or function of a combustion chamber. Features that are of interest for
general construction purposes should be classified in general places for building or
construction. Examples of such places can be found under the heading "Informative
references" below.
References relevant to classification in this subclass
This subclass does not cover:
Construction or support of tube walls for steam boilers
F22B
Examples of places where the subject matter of this class is covered when specially adapted,
used for a particular purpose, or incorporated in a larger system:
Preventing corrosion in apparatus specially adapted for
combustion of waste or low-grade fuels, e.g. incinerators
F23G 5/44
Film cooling arrangements for gas turbine combustion chambers
F23R 3/00
Construction of tiles or bracing means therefor for domestic
masonry stoves for solid fuels
F24B 1/06
Casings for domestic stoves or ranges
F24C 15/08
Casings for water heaters, e.g. heating boilers
F24H 9/02
Casings, linings, wall or roofs of furnaces, kilns, ovens or retorts
F27B, F27D 1/00
Informative references
Attention is drawn to the following places, which may be of interest for search:
General building constructions, e.g. walls, roofs or insulation of
buildings
E04B
Structural elements or building materials, e.g. bricks
E04C
IPC Revision WG – Definition Project
Project: D 273
Subclass: F23M 7/00
Rapporteur Proposal
Date : July 2, 2013
Title Doors
Relationship between large subject matter areas
Combustion apparatus:
This group is a detail place in relation to subclasses F23B, F23C and F23G, which cover
complete apparatus. Arrangements that affect the overall design of a combustion apparatus
should be classified in those subclasses.
Application places for combustion apparatus:
Some door constructions should be considered as special adaptations to special types of
combustion apparatus and therefore classified in the places for these types. Examples of such
places can be found under the heading "References relevant to classification in this subclass"
below.
Places for construction in general:
This group covers special adaptations of doors for specific requirements of combustion
chambers, for example relating to resistance to heat or flames, heat insulation or installation
of burners or other combustion equipment. Features that are of interest for general
construction purposes should be classified in general places for building or construction.
Examples of such places can be found under the heading "Informative references" below.
References relevant to classification in this subclass
Examples of places where the subject matter of this class is covered when specially adapted,
used for a particular purpose, or incorporated in a larger system:
Doors for open fires for solid fuels
F24B 1/192
Doors specially adapted for domestic stoves or ranges
F24C 15/02
Doors for furnaces, kilns, ovens or retorts
F27D 1/18
Informative references
Attention is drawn to the following places, which may be of interest for search:
Bolts or fastening devices for doors
E05C
Hinges or other suspension devices for doors
E05D
Operating mechanisms for doors
E05F
Doors in general
E06B
IPC Revision WG – Definition Project
Project: D 273
Subclass: F23M 9/00
Rapporteur Proposal
Date : July 2, 2013
Title Baffles or deflectors for air or combustion products;
Flame shields
Relationship between large subject matter areas
Combustion apparatus:
This group is a detail place in relation to subclasses F23B, F23C, F23G and F23R, which
cover complete apparatus. Arrangements that affect the overall design of a combustion
chamber or the entire combustion process in the apparatus should be classified in those
subclasses, for example in F23B 80/04, F23C 9/00 or F23R 3/16.
Application places for combustion apparatus:
Some baffles, deflectors or flame shields should be considered as special adaptations to
special types of combustion apparatus and therefore classified in the places for these types.
Examples of such places can be found under the heading "References relevant to
classification in this subclass" below.
References relevant to classification in this subclass
This subclass does not cover:
Baffles or deflectors for air or combustion products structurally
associated with burners
F23D, e.g.
F23D 3/02,
F23D 11/40,
F23D 14/70
Examples of places where the subject matter of this class is covered when specially adapted,
used for a particular purpose, or incorporated in a larger system:
Steam boilers
F22B
Fluid heaters, e.g. heating boilers
F24H
Furnaces, kilns, ovens or retorts
F27B
IPC Revision WG – Definition Project
Project: D 273
Subclass: F23M 11/00
Rapporteur Proposal
Date : July 2, 2013
Title Safety arrangements
Relationship between large subject matter areas
Safety arrangements involving control of combustion:
This group does not cover combustion control systems which maintain safe operating
conditions during normal operation of combustion apparatus, for example by monitoring
temperatures, or react by controlling combustion when undesired or dangerous condition are
detected, for example shutting down the combustion when fuel or air supply is interrupted.
Such control systems are covered by subclass F23N.
Application places for combustion apparatus:
Some safety arrangements should be considered as special adaptations to special types of
combustion apparatus and therefore classified in the places for these types. Examples of such
places can be found under the heading "References relevant to classification in this subclass"
below.
References relevant to classification in this subclass
This subclass does not cover:
Safety arrangements structurally associated with burners
F23D, e.g.
F23D 3/26,
F23D 5/16,
F23D 14/72
Safety devices for liquid fuel feeding
F23K 5/16
Preventing development of abnormal or undesired conditions by
controlling combustion
F23N 5/24
Safety arrangements structurally associated with igniters
F23Q, e.g.
F23Q 7/24,
F23Q 9/12
Examples of places where the subject matter of this class is covered when specially adapted,
used for a particular purpose, or incorporated in a larger system:
Applications, arrangements, or dispositions of automatic safety
devices in steam boilers
F22B 37/42
Safety arrangements in apparatus specially adapted for
combustion of waste or low-grade fuels, e.g. incinerators
F23G 5/50
Arrangement or mounting of safety devices in domestic stoves or
ranges for gaseous fuels
F24C 3/12
Arrangement or mounting of safety devices in domestic stoves or
ranges for liquid fuels
F24C 5/16
Arrangement or mounting of safety devices in fluid heaters, e.g.
heating boilers
F24H 9/20
Arrangement of safety devices in furnaces, kilns, ovens or retorts
F27D 21/00
Informative references
Attention is drawn to the following places, which may be of interest for search:
Fire-fighting
A62C
Extinguishing devices
F23Q 25/00
Fire alarms
G08B 17/00
IPC Revision WG – Definition Project
Project: D 273
Subclass: F23M 20/00
Rapporteur Proposal
Date : July 2, 2013
Title Details of combustion chambers, not otherwise provided for
Relationship between large subject matter areas
This group is the residual group for details of combustion chambers. Therefore classification
should only be made in this group if there is no other place in the IPC that covers the subject
matter to be classified. A list of examples of other places covering details of combustion
apparatus can be found under the heading "References relevant to classification in this
subclass" below.
References relevant to classification in this subclass
Places in relation to which this subclass is residual:
Details of steam boilers
F22B, e.g.
F22B 37/00
Mounting or disposition of burners
F23C 5/00
Supplying air or non-combustible liquids or gases
F23C 7/00, F23L
Details of fluidised bed combustion apparatus
F23C 10/18
Burners
F23D
Details specially adapted for apparatus for combustion of waste
or low-grade fuels, e.g. incinerators
F23G 5/44
Grates; Cleaning or raking grates
F23H
Removal or treatment of combustion products or combustion
residues
F23J
Feeding fuel
F23K
Casings, linings, walls or doors
F23M 3/00 –
F23M 7/00
Devices for deflecting air, flames or combustion products
F23M 9/00
Safety arrangements
F23M 11/00
Ignition
F23Q
Details of stoves or ranges burning solid fuels
F24B 1/191,
F24B 13/00
Details of stoves or ranges burning fuels other than solid fuels
F24C, e.g.
F23C 15/00
Details of fluid heaters, e.g., heating boilers
F24H 9/00
Details of furnaces, kilns, ovens or retorts
F27B, F27D