CPC Definition - Subclass F23J
This place covers:
- All details of devices for removing or treating products or fumes originating from a combustion apparatus, including all relevant accessories and peripheral devices such as for example exhaust gas pipes, cooling arrangements, ash removal systems, arrangements for supplying chemicals to fumes, independently from the type of solid fuel which is burned;
- Arrangements for supplying chemicals to fires;
- Cleaning of surface tubes, flame tubes or surfaces which are contaminated by combustion products or residues.
This place does not cover:
Combustion apparatus for burning smoke or fumes, e.g. exhaust gases |
Attention is drawn to the following places, which may be of interest for search:
Separating dispersed particles from gases in general | |
Separating particles or dust from gases | |
Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases | |
Cleaning pipes in general | |
Removing fumes other than combustion fumes from the area where they are produced, in general | |
Composition of fuels | |
Protection against fire for buildings | |
Chimneys as part of a building | |
Industrial chimney-stacks, i.e. free-standing chimneys | |
Removal or treatment of exhaust gas from internal combustion engines | |
Removing cooking fumes from domestic stoves or ranges | |
Fume conduits of furnaces, kilns, ovens, or retorts | |
Cleaning of surfaces of boiler, heat exchangers or heat transfer conduit contaminated by other than combustion products or residues |
When classifying in this subclass, add codes F23J 2211/00-F23J 2219/80 and F23J 2900/01001-F23J 2900/15081.
Codes F23J 2700/001-F23J 2700/003 are not used.
In this place, the following terms or expressions are used with the meaning indicated:
Air | a mixture of gases containing free oxygen and able to promote or support combustion |
Primary air | air supplied to the burning fuel in order to liberate combustible gases |
Secondary air | air supplied to the combustible gases liberated by the primary air in order to complete their combustion. The term "secondary air" covers "tertiary air" etc. |
Ash | means any solid combustion residues, for example remaining in the fuel bed or suspended in the flue gases |
Burner | a device by which fluid fuel or solid fuel suspended in air is passed to a combustion space where it burns to produce a self-supporting flame |
Combustion | means the direct combination of oxygen gas, e.g. in air, and a burnable substance |
Combustion chamber | a chamber in which fuel is burned to establish a self-supporting fire or flame and which surrounds that fire or flame |
Combustion zone | the part of the apparatus where the reaction takes place between air and fuel |
Flue gases | any gaseous products of combustion |
Grate | a perforated surface, e.g. a grid, which supports or delimits a bed of burning fuel and serves to supply primary air |
In patent documents, the following words/expressions are often used with the meaning indicated:
"boiler" | "combustion apparatus". |
"burner" | "combustion apparatus". |
This place does not cover:
Removing solid particulate material, e.g. fly ash, from flue gases | |
Devices for removal of material from the bed of fluidised bed combustion apparatus |
Attention is drawn to the following places, which may be of interest for search:
Arrangements for collecting bottom ash and fly ash | |
Cleaning devices which form part of the combustion grate |
Attention is drawn to the following places, which may be of interest for search:
Arrangement of devices for treating smoke or fumes for supplying chemicals to fumes | |
Use of additives for fuels or fires |
This place does not cover:
Chimneys | |
Removing cooking fumes from domestic stoves or ranges | |
Fume conduits of furnaces, kilns, ovens, or retorts |
Attention is drawn to the following places, which may be of interest for search:
Removing fumes other than combustion fumes from the area where they are produced, in general | |
Protecting buildings against heat | |
Protecting buildings against fire | |
Insulation for protection against fire | |
Heat insulation in general |
This place does not cover:
Side-supporting means for chimney stacks | |
Ladders permanently attached to chimneys | |
Draught-inducing apparatus associated with chimneys or flues | |
Tops for chimneys, terminals for flues |
Attention is drawn to the following places, which may be of interest for search:
Pipes in general |
Attention is drawn to the following places, which may be of interest for search:
Pipe joints in general |
Attention is drawn to the following places, which may be of interest for search:
Doors or covers in general |
Devices or methods per se for treating smoke or fumes are classified in the relevant places for the treatment. For example, chemical or biological purification of waste gases per se is classified in group B01D 53/00.
Attention is drawn to the following places, which may be of interest for search:
Traps for solid deposits | |
Supplying chemicals to fire | |
Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases |
Attention is drawn to the following places, which may be of interest for search:
Arrangement of devices for supplying chemicals to fire |
This place does not cover:
Scrubbers for removing solids only |