F23R GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS (fluidised bed combustion apparatus specially adapted for operation at superatmospheric pressures F23C10/16)
Introduced: September 1968
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.
Title
Titles differ between systems:
IPC: GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
CPC: GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS (fluidised bed combustion apparatus specially adapted for operation at superatmospheric pressures F23C10/16)
Full Title
Full titles differ between systems:
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 (fluidised bed combustion apparatus specially adapted for operation at superatmospheric pressures F23C10/16)
Additional Content IPC
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
Of 4 combined children, 3 exist in both systems.
1 codes are CPC-only extensions.
Note: 1 CPC extensions are marked as secondary classification only.
IPC defines codes here since 1980.
Child Classifications
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- F23R 2900/00 Special features of, or arrangements for continuous combustion chambers; Combustion processes therefor 2nd only +25 CPC CPC only CPC only
- F23R 3/00 Continuous combustion chambers using liquid or gaseous fuel since 1980 +3 CPC IPC+CPC Available in IPC and CPC
- F23R 5/00 Continuous combustion chambers using solid or pulverulent fuel since 1980 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