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IPC Main Group
F24D 7/00

Central heating systems employing heat-transfer fluids not covered by groups , e.g. oil, salt or gas

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 7/00 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

Top Applicants

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

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