F23J REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES (combustion apparatus for consuming smoke or fumes, e.g. exhaust gases, F23G7/06)
Introduced: September 1968
Description
F23J covers technologies for managing exhaust gases, particulates, and residual matter generated by combustion processes, along with the flue systems that transport these byproducts. This includes dust collectors, ash removal equipment, scrubbers, and related treatment systems for both solid and gaseous combustion residues. The classification encompasses flue design, draft control, and ancillary equipment that processes or directs combustion products from furnaces, boilers, and other combustion apparatus. Related dust separation and air pollution control measures are included where integral to combustion residue management.
Title
Titles differ between systems:
IPC: REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
CPC: REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES (combustion apparatus for consuming smoke or fumes, e.g. exhaust gases, F23G7/06)
Full Title
Full titles differ between systems:
REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES (combustion apparatus for consuming smoke or fumes, e.g. exhaust gases, F23G7/06)
Of 15 combined children, 8 exist in both systems.
7 codes are CPC-only extensions.
Note: 7 CPC extensions are marked as secondary classification only.
3 shared codes have differing titles between IPC and CPC.
Child Classifications
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- F23J 1/00 Removing ash, clinker, or slag from combustion chambers ( devices for removal of material from the bed of fluidised bed combustion apparatus F23C10/24) IPC+CPC Available in IPC and CPC
- F23J 11/00 Devices for conducting smoke or fumes, e.g. flues (chimney stacks E04H12/28; removing cooking fumes from domestic stoves or ranges F24C15/20 ) IPC+CPC Available in IPC and CPC
- F23J 13/00 Fittings for chimneys or flues (side-supporting means for chimney stacks E04H12/20; ladders permanently attached to chimneys E06C9/00; draught-inducing apparatus associated with chimneys or flues F23L17/00; tops for chimneys, terminals for flues F23L17/02) IPC+CPC Available in IPC and CPC
- F23J 15/00 Arrangements of devices for treating smoke or fumes +2 CPC IPC+CPC Available in IPC and CPC
- F23J 2700/00 Ash removal, handling and treatment means; Ash and slag handling in pulverulent fuel furnaces; Ash removal means for incinerators 2nd only +3 CPC CPC only CPC only
- F23J 2900/00 Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes 2nd only +34 CPC CPC only CPC only
- F23J 3/00 Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers IPC+CPC Available in IPC and CPC
- F23J 9/00 Preventing premature solidification of molten combustion residues IPC+CPC Available in IPC and CPC
- F23J 99/00 Subject matter not provided for in other groups of this subclass since 2006 IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
Class F23,2013–2023, worldwide · Source: EPO PATSTAT
- GE (GENERAL ELECTRIC COMPANY) US 2,124
- XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY 1,369
- NINGBO FOTILE KITCHENWARE COMPANY 1,363
- SIEMENS DE 997
- UNITED TECHNOLOGIES CORPORATION (UTC) US 937
- GE (GENERAL ELECTRIC COMPANY) 898
- VATTI 815
- CHINESE ACADEMY OF SCIENCES 719
- RINNAI COMPANY 708
- MITSUBISHI HITACHI POWER SYSTEMS 670
Top Applicants (CPC)
Class F23,2013–2023, worldwide · Source: EPO PATSTAT
- GE (GENERAL ELECTRIC COMPANY) US 2,581
- UNITED TECHNOLOGIES CORPORATION (UTC) US 1,180
- SIEMENS DE 1,157
- GE (GENERAL ELECTRIC COMPANY) 994
- XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY 769
- MITSUBISHI HEAVY INDUSTRIES JP 701
- MITSUBISHI HITACHI POWER SYSTEMS JP 695
- RAYTHEON TECHNOLOGIES CORPORATION US 587
- NINGBO FOTILE KITCHENWARE COMPANY 543
- GENERAL ELECTRIC TECHNOLOGY CH 490