Feeding or distributing of lump or pulverulent fuel to combustion apparatus

Introduced: September 1968

Last revised: January 2006

Classification Context

Section:: MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
Class:: COMBUSTION APPARATUS; COMBUSTION PROCESSES
Subclass:: FEEDING FUEL TO COMBUSTION APPARATUS

Filing statistics

IPC F23K 3/00 belongs to the parent subclass F23K, which recorded 17,228 patent applications worldwide between 2013 and 2023. Annual filings grew from 1,169 in 2013 to 1,709 in 2023 (+46%), peaking at 2,026 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

7 direct subcodes

Child Classifications

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F23K 3/02 Pneumatic feeding arrangements, i.e. by air blast
F23K 3/04 for locomotive boiler furnaces
F23K 3/06 for shaft-type furnaces
F23K 3/08 for furnaces having movable grate bars
F23K 3/1 Under-feed arrangements
F23K 3/16 Over-feed arrangements
F23K 3/22 Controlling thickness of fuel bed

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