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IPC Subclass
F23R

GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS

Introduced: September 1968

Classification Context

Section:
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
Class:
COMBUSTION APPARATUS; COMBUSTION PROCESSES
Subclass:
GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS

Description

F23R covers combustion chambers and apparatus designed to generate high-pressure or high-velocity combustion products, particularly those used in gas turbines, jet engines, and similar applications requiring rapid gas expansion and discharge. This subclass includes the design, construction, and operation of combustion systems that produce intense thermal energy and directional flow suitable for powering turbomachinery. Technologies encompassed include fuel injection systems, flame stabilization mechanisms, combustor liners, and thermal management strategies specific to high-performance combustion environments. Related adjacent classes cover general combustion apparatus (F23B–F23Q) and specific combustion process details, while F23R focuses on the chamber and system architecture necessary for generating elevated pressure or velocity conditions.

Filing statistics

IPC subclass F23R recorded 17,458 patent applications worldwide between 2013 and 2023. Annual filings declined from 1,858 in 2013 to 1,390 in 2023 (-25%), peaking at 2,097 applications in 2014. 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

F23R ranks 6th of 12 subclasses with filings in F23, with 17,458 applications between 2013 and 2023, 5.8% of the class. Annual filings declined 25% from 2013 to 2023, below the class as a whole (+76%).

Top 10 of 12 subclasses of class F23 by patent applications, 2013–2023
RankSubclassTitleApplicationsShare
1F23J, Removal or Treatment of Combustion Products or Combustion Residues; FluesRemoval or Treatment of Combustion Products or Combustion Residues; Flues62,84520.9%
2F23G, Cremation Furnaces; Consuming Waste or Low Grade Fuels by CombustionCremation Furnaces; Consuming Waste or Low Grade Fuels by Combustion62,60520.8%
3F23D, BurnersBurners48,00815.9%
4F23L, 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 FluesSupplying 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 Flues24,2798.1%
5F23C, Methods or Apparatus for Combustion Using Fluid Fuel or Solid Fuel Suspended in AirMethods or Apparatus for Combustion Using Fluid Fuel or Solid Fuel Suspended in Air19,3046.4%
6F23RGenerating Combustion Products of High Pressure or High Velocity, e.g. Gas-Turbine Combustion Chambers17,4585.8%
7F23K, Feeding Fuel to Combustion ApparatusFeeding Fuel to Combustion Apparatus17,2285.7%
8F23N, Regulating or Controlling CombustionRegulating or Controlling Combustion15,4005.1%
9F23Q, Ignition; Extinguishing DevicesIgnition; Extinguishing Devices12,4424.1%
10F23B, Methods or Apparatus for Combustion Using Only Solid FuelMethods or Apparatus for Combustion Using Only Solid Fuel9,9433.3%

Source: EPO PATSTAT, worldwide filings

Additional Content

Glossary

Flame tube flame tubes The portion of a combustion chamber downstream of the zone where fuel and primary air are mixed.

Limiting references

Fluidised bed combustion chambers specially adapted for operation at superatmospheric pressures

Application references

Combined gas-turbine and steam-turbine plants Gas-turbine plants e.g. , Combustion-product positive-displacement engine plants Jet-propulsion plants e.g. Combustion chambers for rocket engine plants, i.e. plants carrying both fuel and oxidant therefor Starting of engines by supplying pressure fluid generated directly by combustion

Related Keywords

BURNERS generating combustion products of high velocity or pressurecombustion CHAMBER(S) for generating combustion products of high pressure or high velocitygenerating COMBUSTION products of high pressure or high velocity

3 direct subcodes

Child Classifications

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  • F23R 5/00 Continuous combustion chambers using solid or pulverulent fuel
  • F23R 7/00 Intermittent or explosive combustion chambers

Top Applicants

Top 10 applicants by patent filingsfor class F23, 2013–2023, worldwide · Source: EPO PATSTAT

  1. GE (GENERAL ELECTRIC COMPANY) US 2,124
  2. XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY 1,369
  3. NINGBO FOTILE KITCHENWARE COMPANY 1,363
  4. SIEMENS DE 997
  5. UNITED TECHNOLOGIES CORPORATION (UTC) US 937
  6. GE (GENERAL ELECTRIC COMPANY) 898
  7. VATTI 815
  8. CHINESE ACADEMY OF SCIENCES 719
  9. RINNAI COMPANY 708
  10. MITSUBISHI HITACHI POWER SYSTEMS 670