F23G CREMATION FURNACES; CONSUMING WASTE OR LOW GRADE FUELS BY COMBUSTION
Introduced: September 1968
Classification Context
- Section:
- MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- Class:
- COMBUSTION APPARATUS; COMBUSTION PROCESSES
- Subclass:
- CREMATION FURNACES; CONSUMING WASTE OR LOW GRADE FUELS BY COMBUSTION
Description
F23G covers furnaces designed for cremation of human or animal remains, as well as combustion systems for disposing of waste materials or burning low-grade fuels. This subclass includes the structural design, heat management, emission control, and operational features of crematory equipment and waste-to-energy combustion installations. Technologies addressing ash handling, temperature regulation, and pollution mitigation in such facilities fall within this scope, whereas general industrial furnaces for standard fuel combustion are classified elsewhere under F23.
Filing statistics
IPC subclass F23G recorded 62,605 patent applications worldwide between 2013 and 2023. Annual filings grew from 2,172 in 2013 to 6,735 in 2023 (+210%), peaking at 9,407 applications in 2020. The most active applicants in class F23 are GE (GENERAL ELECTRIC COMPANY) (2,124 applications), XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY (1,369 applications) and NINGBO FOTILE KITCHENWARE COMPANY (1,363 applications).
Source: EPO PATSTAT, worldwide filings
In class comparison
F23G ranks 2nd of 12 subclasses with filings in F23, with 62,605 applications between 2013 and 2023, 20.8% of the class. Annual filings grew 210% from 2013 to 2023, above the class as a whole (+76%).
| Rank | Subclass | Title | Applications | Share |
|---|---|---|---|---|
| 1 | F23J, Removal or Treatment of Combustion Products or Combustion Residues; Flues | Removal or Treatment of Combustion Products or Combustion Residues; Flues | 62,845 | 20.9% |
| 2 | F23G | Cremation Furnaces; Consuming Waste or Low Grade Fuels by Combustion | 62,605 | 20.8% |
| 3 | F23D, Burners | Burners | 48,008 | 15.9% |
| 4 | F23L, Supplying Air or Non-Combustible Liquids or Gases to Combustion Apparatus in General; Valves or Dampers Specially Adapted for Controlling Air Supply or Draught in Combustion Apparatus; Inducing Draught in Combustion Apparatus; Tops for Chimneys or Ventilating Shafts; Terminals for Flues | Supplying Air or Non-Combustible Liquids or Gases to Combustion Apparatus in General; Valves or Dampers Specially Adapted for Controlling Air Supply or Draught in Combustion Apparatus; Inducing Draught in Combustion Apparatus; Tops for Chimneys or Ventilating Shafts; Terminals for Flues | 24,279 | 8.1% |
| 5 | F23C, Methods or Apparatus for Combustion Using Fluid Fuel or Solid Fuel Suspended in Air | Methods or Apparatus for Combustion Using Fluid Fuel or Solid Fuel Suspended in Air | 19,304 | 6.4% |
| 6 | F23R, Generating Combustion Products of High Pressure or High Velocity, e.g. Gas-Turbine Combustion Chambers | Generating Combustion Products of High Pressure or High Velocity, e.g. Gas-Turbine Combustion Chambers | 17,458 | 5.8% |
| 7 | F23K, Feeding Fuel to Combustion Apparatus | Feeding Fuel to Combustion Apparatus | 17,228 | 5.7% |
| 8 | F23N, Regulating or Controlling Combustion | Regulating or Controlling Combustion | 15,400 | 5.1% |
| 9 | F23Q, Ignition; Extinguishing Devices | Ignition; Extinguishing Devices | 12,442 | 4.1% |
| 10 | F23B, Methods or Apparatus for Combustion Using Only Solid Fuel | Methods or Apparatus for Combustion Using Only Solid Fuel | 9,943 | 3.3% |
Source: EPO PATSTAT, worldwide filings
Additional Content
Glossary
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 expression "secondary air" covers "tertiary air" etc. Burner burners 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. A burner includes the means for feeding air that are arranged in immediate connection with a fuel feeding conduit, for example concentric with it. 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 Combustion chamber combustion chambers a chamber in which fuel is burned to establish a self-supporting fire or flame and which surrounds that fire or flame combustion zone combustion zones the part of a combustion apparatus where the reaction takes place between air and fuel fuel Fuels any combustible material that can be burned, regardless of whether the main purpose of burning it is for releasing energy therefrom or for disposing of it or rendering it less harmful waste an undesired material that can be consumed by combustion for the primary purpose of disposing of it or rendering it less harmful, and not solely for releasing energy therefrom
Limiting references
Incinerating radioactive waste
Application references
Disposal of solid waste Reclamation of contaminated soil Gas turbine plants Generating steam Generating combustion products of high temperature or high pressure Domestic stoves or ranges for local heating or cooking , Apparatus for heat treatment of materials or articles
Related Keywords
3 direct subcodes
Child Classifications
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- F23G 1/00 Methods or apparatus specially adapted for cremation of human or animal carcasses
- F23G 5/00 Methods or apparatus, e.g. incinerators, specially adapted for combustion of waste or low-grade fuels
- F23G 7/00 Methods or apparatus, e.g. incinerators, specially adapted for combustion of specific waste or low grade fuels, e.g. chemicals
Top Applicants
Top 10 applicants by patent filingsfor 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