Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems

Introduced: September 1968

Last revised: January 2006

Classification Context

Section:: MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
Class:: HEATING; RANGES; VENTILATING
Subclass:: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING

Filing statistics

IPC F24F 3/00 belongs to the parent subclass F24F, which recorded 427,113 patent applications worldwide between 2013 and 2023. Annual filings grew from 18,421 in 2013 to 43,974 in 2023 (+139%), peaking at 53,956 applications in 2020. The most active applicants in class F24 are MIDEA (21,834 applications), GREE ELECTRIC APPLIANCES (21,535 applications) and GUANGDONG MIDEA REFRIGERATION EQUIPMENT COMPANY (20,870 applications).

Source: EPO PATSTAT, worldwide filings

4 direct subcodes

Child Classifications

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F24F 3/02 characterised by the pressure or velocity of the primary air
F24F 3/044 Systems in which all treatment is given in the central station, i.e. all-air systems
F24F 3/06 characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
F24F 3/12 characterised by the treatment of the air otherwise than by heating and cooling

Top Applicants

Top 10 applicants by patent filingsfor class F24, 2013–2023, worldwide · Source: EPO PATSTAT

MIDEA 21,834
GREE ELECTRIC APPLIANCES 21,535
GUANGDONG MIDEA REFRIGERATION EQUIPMENT COMPANY 20,870
QINGDAO HAIER AIR CONDITIONER COMPANY 15,443
HAIER SMART HOME 15,442
QINGDAO HAIER AIR CONDITIONER ELECTRIC COMPANY 10,008
AUX AIR CONDITIONING COMPANY 7,723
NINGBO AUX ELECTRIC COMPANY 7,499
NINGBO FOTILE KITCHENWARE COMPANY 6,712
LG ELECTRONICS KR 6,441