|  | F |
SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

|  | F01 - F04 |
Subsection index
MACHINES |
positive displacement |
rotary or oscillating piston |
liquid and elastic fluid or elastic fluid | F01C
liquid only | F04C
reciprocating piston or other |
liquid and elastic fluid or elastic fluid | F01B
liquid only | F04B
non-positive displacement |
liquid and elastic fluid or elastic fluid | F01D
liquid only | F03B
ENGINES |
positive displacement |
rotary or oscillating piston |
liquid and elastic fluid or elastic fluid | F01C
liquid only | F03C
reciprocating piston or other |
liquid and elastic fluid or elastic fluid | F01B
liquid only | F03C
non-positive displacement |
liquid and elastic fluid or elastic fluid | F01D
liquid only | F03B
PUMPS |
positive displacement |
rotary or oscillating piston | F04C
reciprocating piston or other | F04B
non-positive displacement | F04D

LIGHTING; HEATING

|  | F23 |
COMBUSTION APPARATUS; COMBUSTION PROCESSES

|  | F23 |
Note(s) In this class, the following terms or expressions are used with the meanings indicated: "combustion" means the direct combination of oxygen gas, e.g. in air, and a burnable substance. Any other heat-producing combination of chemical substances, e.g. hydrogen peroxide and methane, iron oxide and aluminium, is covered by section C or by subclass Fulltext... Hierarchy... Expanded...F24J; "combustion chamber" means a chamber in which fuel is burned to establish a self-supporting fire or flame and which surrounds that fire or flame; "burner" means a device by which fluent fuel is passed to a combustion space where it burns to produce a self-supporting flame; "air" means a mixture of gases containing free oxygen and able to promote or support combustion.

|  | F23J |
REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES (precipitating dust from flue gases Fulltext... Hierarchy... Expanded...B01D; composition of fuels Fulltext... Hierarchy... Expanded...C10; combustion apparatus for consuming smoke or fumes, e.g. exhaust gases, Fulltext... Hierarchy... Expanded...F23G 7/06)

|  | F23J |
Note(s) This subclass covers also the cleaning of surfaces of furnace tubes, flame tubes, water tubes, flues or the like of boilers, heat-exchange or heat-transfer conduits, which surfaces are contaminated by combustion products or combustion residues. This subclass does not cover the cleaning of surfaces of boilers, heat exchange or heat-transfer conduits contaminated by other than combustion products or combustion residues, which is covered by subclass Fulltext... Hierarchy... Expanded...F28G.

|  | F23J |
Subclass index
REMOVAL OF SOLID COMBUSTION PRODUCTS OR RESIDUES |
From combustion chamber | 1/00
From places beyond the fire | 3/00
TREATMENT OF COMBUSTION PRODUCTS OR RESIDUES |
Supply of chemicals; preventing solidification; Treating smoke or fumes | 7/00; 9/00; 15/00
FLUES, FITTINGS FOR CHIMNEYS OR FLUES | 11/00, 13/00
SUBJECT MATTER NOT PROVIDED FOR IN OTHER GROUPS OF THIS SUBCLASS | 99/00

P:40 |  | F23J 1/00 |
Removing ash, clinker, or slag from combustion chambers (devices for removal of material from the bed of fluidised bed combustion apparatus Fulltext... Hierarchy... Expanded...F23C 10/00)

|  | F23J 1/02 |
· | Apparatus for removing ash, clinker, or slag from ash-pits, e.g. by employing trucks or conveyers, by employing suction devices

|  | F23J 1/04 |
· | Hand tools, e.g. rakes, prickers, tongs

|  | F23J 1/06 |
· | Mechanically-operated devices, e.g. clinker pushers (forming part of the grate Fulltext... Hierarchy... Expanded...F23H)

|  | F23J 1/08 |
· | Liquid slag removal [3]

P:30 |  | F23J 3/00 |
Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers

P:10 |  | F23J 7/00 |
Arrangement of devices for supplying chemicals to fire (supplying chemicals to fire Fulltext... Hierarchy... Expanded...C10L)

P:0 |  | F23J 9/00 |
Preventing premature solidification of molten combustion residues

P:50 |  | F23J 11/00 |
Devices for conducting smoke or fumes, e.g. flues (heat insulation therefor Fulltext... Hierarchy... Expanded...E04B 1/94; chimneys Fulltext... Hierarchy... Expanded...E04H 12/00; removing cooking fumes from domestic stoves or ranges Fulltext... Hierarchy... Expanded...F24C 15/20) [5]

P:60 |  | F23J 13/00 |
Fittings for chimneys or flues (staying, stiffening Fulltext... Hierarchy... Expanded...E04H; means for facilitating climbing Fulltext... Hierarchy... Expanded...E06C; draught-inducing apparatus associated with chimneys or flues Fulltext... Hierarchy... Expanded...F23L)

P:20 |  | F23J 15/00 |
Arrangements of devices for treating smoke or fumes (such devices per se, methods for treating smoke or fumes, see the relevant places for the treatment, e.g. Fulltext... Hierarchy... Expanded...B01D 53/00)

|  | F23J 15/02 |
· | of purifiers, e.g. for removing noxious material (traps for solid residues Fulltext... Hierarchy... Expanded...F23J 3/00) [6]

|  | F23J 15/06 |
· | of coolers [6]

|  | F23J 15/08 |
· | of heaters [6]

P:70 |  | F23J 99/00 |
Subject matter not provided for in other groups of this subclass [8]