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IPC Main Group
F28F 13/00

Arrangements for modifying heat transfer, e.g. increasing, decreasing

Introduced: September 1968

Last revised: January 2006

Classification Context

Section:
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
Class:
HEAT EXCHANGE IN GENERAL
Subclass:
DETAILS OF HEAT-EXCHANGE OR HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION

Filing statistics

IPC F28F 13/00 belongs to the parent subclass F28F, which recorded 136,716 patent applications worldwide between 2013 and 2023. Annual filings grew from 8,338 in 2013 to 16,393 in 2023 (+97%), peaking at 17,090 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

6 direct subcodes

Child Classifications

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  • F28F 13/02 by influencing fluid boundary
  • F28F 13/04 by preventing the formation of continuous films of condensate on heat-exchange surfaces, e.g. by promoting droplet formation
  • F28F 13/14 by endowing the walls of conduits with zones of different degrees of conduction of heat
  • F28F 13/16 by applying an electrostatic field to the body of the heat-exchange medium
  • F28F 13/18 by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing

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