F23D BURNERS
Description
F23D covers the design and construction of burners used in combustion apparatus for heating, power generation, and other thermal applications. This subclass includes gas burners, oil burners, pulverized fuel burners, and combination fuel burners, along with their structural components such as fuel injection systems, air supply mechanisms, and flame stabilization devices. The classification encompasses burner types ranging from domestic appliances to industrial furnaces and boilers, but excludes the overall combustion apparatus design (covered by F23B) and specific combustion process control methods (covered by F23N).
Filing statistics
CPC subclass F23D recorded 25,989 patent applications worldwide between 2013 and 2023. Annual filings grew from 1,982 in 2013 to 2,106 in 2023 (+6%), peaking at 2,887 applications in 2018. The most active applicants in class F23 are GE (GENERAL ELECTRIC COMPANY) (2,581 applications), UNITED TECHNOLOGIES CORPORATION (UTC) (1,180 applications) and SIEMENS (1,157 applications).
Source: EPO PATSTAT, worldwide filings
26 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- F23D 1/00 Burners for combustion of pulverulent fuel
- F23D 11/00 Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D 14/00 Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D 17/00 Burners for combustion simultaneously or alternately of gaseous or liquid or pulverulent fuel
- F23D 2200/00 Burners for fluid fuel
- F23D 2201/00 Burners adapted for particulate solid or pulverulent fuels
- F23D 2202/00 Liquid fuel burners
- F23D 2203/00 Gaseous fuel burners
- F23D 2204/00 Burners adapted for simultaneous or alternative combustion having more than one fuel supply
- F23D 2205/00 Assemblies of two or more burners, irrespective of fuel type
- F23D 2206/00 Burners for specific applications
- F23D 2207/00 Ignition devices associated with burner
- F23D 2208/00 Control devices associated with burners
- F23D 2209/00 Safety arrangements
- F23D 2210/00 Noise abatement
- F23D 2211/00 Thermal dilatation prevention or compensation
- F23D 2212/00 Burner material specifications
- F23D 2213/00 Burner manufacture specifications
- F23D 2214/00 Cooling
- F23D 23/00 Assemblies of two or more burners (gas burners with provision for a retention flame F23D14/26)
Top Applicants
Top 10 applicants by patent filingsfor 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