Special features of, or arrangements for controlling combustion

Filing statistics

CPC F23N 2900/00 belongs to the parent subclass F23N, which recorded 13,537 patent applications worldwide between 2013 and 2023. Annual filings declined from 1,173 in 2013 to 1,139 in 2023 (-3%), peaking at 1,525 applications in 2020. 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

10 direct subcodes

Child Classifications

Navigate with arrow keys, Enter to open

F23N 2900/01001 Micro Electro Mechanical Systems [MEMS] for controlling fuel supply to burners
F23N 2900/01002 Electromagnetically operated fuel valves with a single solenoid controlling two or more cores
F23N 2900/05001 Measuring CO content in flue gas
F23N 2900/05002 Measuring CO2 content in flue gas
F23N 2900/05003 Measuring NOx content in flue gas
F23N 2900/05004 Details of components, e.g. connecting adaptors
F23N 2900/05005 Mounting arrangements for sensing, detecting or measuring devices
F23N 2900/05006 Controlling systems using neuronal networks
F23N 2900/05101 Connections between thermocouple and magnetic valves, e.g. by plug and socket connectors
F23N 2900/05181 Controlling air to fuel ratio by using a single differential pressure detector

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