|  | 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.

|  | F23B |
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, Fulltext... Hierarchy... Expanded...C11C, Fulltext... Hierarchy... Expanded...F23C, Fulltext... Hierarchy... Expanded...F23D; using solid fuel suspended in air Fulltext... Hierarchy... Expanded...F23C, Fulltext... Hierarchy... Expanded...F23D 1/00; using solid fuel suspended in liquids Fulltext... Hierarchy... Expanded...F23C, Fulltext... Hierarchy... Expanded...F23D 11/00; using solid fuel and fluent fuel simultanenously or alternately Fulltext... Hierarchy... Expanded...F23C, Fulltext... Hierarchy... Expanded...F23D 17/00)

|  | F23B |
Note(s) This subclass only covers combustion wherein the main body of fuel is either essentially stationary during combustion or mechanically transported, as opposed to pneumatically transported or suspended in air, during combustion. [8] In this subclass, the first place priority rule is applied, i.e. at each hierarchical level, classification is made in the first appropriate place. [8] In this subclass, methods are classified in the groups that cover the apparatus used. Methods that are not related to a particular type of apparatus are classified in group Fulltext... Hierarchy... Expanded...F23B 90/00. [8]

|  | F23B - F23B 103/00 |
Note(s) In this subclass, it is desirable to add the indexing codes of groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F23B 101/00-F23B 103/00. [8]

|  | F23B |
Subclass index
COMBUSTION APPARATUS |
Combinations of two or more combustion chambers | 10/00
Specially adapted for portability or transportability | 20/00
Functional types | 30/00 - 60/00
Returning solid combustion residues to the combustion chamber | 70/00
Creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel | 80/00
COMBUSTION METHODS NOT RELATED TO A PARTICULAR TYPE OF APPARATUS | 90/00
SUBJECT MATTER NOT PROVIDED FOR IN OTHER GROUPS OF THIS SUBCLASS | 99/00

P:10 |  | F23B 10/00 |
Combustion apparatus characterised by the combination of two or more combustion chambers [8]

P:20 |  | F23B 20/00 |
Combustion apparatus specially adapted for portability or transportability [8]

P:30 |  | F23B 30/00 |
Combustion apparatus with driven means for agitating the burning fuel; Combustion apparatus with driven means for advancing the burning fuel through the combustion chamber [8]

|  | F23B 30/02 |
· | with movable, e.g. vibratable, fuel-supporting surfaces; with fuel-supporting surfaces that have movable parts [8]

|  | 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 [8]

|  | F23B 30/06 |
· · | with fuel-supporting surfaces that are specially adapted for advancing the fuel through the combustion zone [8]

|  | F23B 30/08 |
· · · | with fuel-supporting surfaces that move through the combustion zone, e.g. with chain grates [8]

|  | 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 [8]

P:40 |  | F23B 40/00 |
Combustion apparatus with driven means for feeding fuel into the combustion chamber [8]

|  | F23B 40/02 |
· | the fuel being fed by scattering over the fuel-supporting surface [8]

|  | F23B 40/04 |
· | the fuel being fed from below through an opening in the fuel-supporting surface [8]

|  | F23B 40/06 |
· | the fuel being fed along the fuel-supporting surface [8]

|  | F23B 40/08 |
· · | into pot- or trough-shaped grates [8]

P:50 |  | F23B 50/00 |
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 [8]

|  | F23B 50/02 |
· | the fuel forming a column, stack or thick layer with the combustion zone at its bottom [8]

|  | F23B 50/04 |
· · | the movement of combustion air and flue gases being substantially transverse to the movement of the fuel [8]

|  | F23B 50/06 |
· · | the flue gases being removed downwards through one or more openings in the fuel-supporting surface [8]

|  | F23B 50/08 |
· · | with fuel-deflecting bodies forming free combustion spaces inside the fuel layer [8]

|  | F23B 50/10 |
· · | with the combustion zone at the bottom of fuel-filled conduits ending at the surface of a fuel bed [8]

|  | 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 [8]

P:60 |  | F23B 60/00 |
Combustion apparatus in which the fuel burns essentially without moving [8]

|  | F23B 60/02 |
· | with combustion air supplied through a grate [8]

P:70 |  | F23B 70/00 |
Combustion apparatus characterised by means for returning solid combustion residues to the combustion chamber [8]

P:80 |  | F23B 80/00 |
Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel [8]

|  | F23B 80/02 |
· | by means for returning flue gases to the combustion chamber or to the combustion zone [8]

|  | F23B 80/04 |
· | by means for guiding the flow of flue gases, e.g. baffles [8]

P:90 |  | F23B 90/00 |
Combustion methods not related to a particular type of apparatus [8]

P:100 |  | F23B 99/00 |
Subject matter not provided for in other groups of this subclass [8]

|  | F23B 101/00 - F23B 103/00 |
Indexing scheme related to adaptation of combustion apparatus to boilers [8]

P:110 |  | F23B 101/00 |
Adaptation of combustion apparatus to boilers in which the combustion chamber is situated inside the boiler vessel, e.g. surrounded by cooled surfaces [8]

P:120 |  | F23B 103/00 |
Adaptation of combustion apparatus for placement in or against an opening of a boiler, e.g. for replacing an oil burner [8]

|  | F23B 103/02 |
· | for producing an essentially horizontal flame [8]