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IPC Main Group
F28D 20/00

Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups or

Introduced: January 1985

Last revised: January 2006

Classification Context

Section:
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
Class:
HEAT EXCHANGE IN GENERAL
Subclass:
HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT; HEAT STORAGE PLANTS OR APPARATUS IN GENERAL

Filing statistics

IPC F28D 20/00 belongs to the parent subclass F28D, which recorded 137,561 patent applications worldwide between 2013 and 2023. Annual filings grew from 7,447 in 2013 to 16,228 in 2023 (+118%), peaking at 17,519 applications in 2020. The most active applicants in class F28 are VALEO SYSTEMES THERMIQUES (1,902 applications), MITSUBISHI ELECTRIC CORPORATION (1,327 applications) and GREE ELECTRIC APPLIANCES (1,152 applications).

Source: EPO PATSTAT, worldwide filings

Additional Content

Other domestic- or space-heating systems consisting of self-contained heating units, e.g. storage heaters Arrangement for storing heat collected by solar heat collectors

1 direct subcode

Child Classifications

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Top Applicants

Top 10 applicants by patent filingsfor class F28, 2013–2023, worldwide · Source: EPO PATSTAT

  1. VALEO SYSTEMES THERMIQUES FR 1,902
  2. MITSUBISHI ELECTRIC CORPORATION JP 1,327
  3. GREE ELECTRIC APPLIANCES 1,152
  4. MAHLE INTERNATIONAL DE 999
  5. ALFA LAVAL SE 960
  6. HANON SYSTEMS KR 917
  7. DENSO CORPORATION 905
  8. DENSO CORPORATION JP 802
  9. CHINESE ACADEMY OF SCIENCES 787
  10. XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY 762