Hot-water central heating systems

Introduced: September 1968

Last revised: January 2022

Classification Context

Section:: MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
Class:: HEATING; RANGES; VENTILATING
Subclass:: DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR

Filing statistics

IPC F24D 3/00 belongs to the parent subclass F24D, which recorded 88,434 patent applications worldwide between 2013 and 2023. Annual filings grew from 5,408 in 2013 to 8,321 in 2023 (+54%), peaking at 10,820 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

6 direct subcodes

Child Classifications

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F24D 3/02 with forced circulation, e.g. by pumps
F24D 3/04 with the water under high pressure
F24D 3/08 in combination with systems for domestic hot-water supply
F24D 3/1 Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks
F24D 3/12 Tube and panel arrangements for ceiling, wall, or underfloor heating
F24D 3/18 using heat pumps

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