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CPC Main Group
F28D 19/00

Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium

Filing statistics

CPC F28D 19/00 belongs to the parent subclass F28D, which recorded 92,000 patent applications worldwide between 2013 and 2023. Annual filings grew from 7,164 in 2013 to 7,786 in 2023 (+9%), peaking at 9,759 applications in 2020. The most active applicants in class F28 are VALEO SYSTEMES THERMIQUES (1,945 applications), MITSUBISHI ELECTRIC CORPORATION (1,518 applications) and MAHLE INTERNATIONAL (1,120 applications).

Source: EPO PATSTAT, worldwide filings

2 direct subcodes

Child Classifications

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  • F28D 19/02 using granular particles

Top Applicants

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

  1. VALEO SYSTEMES THERMIQUES FR 1,945
  2. MITSUBISHI ELECTRIC CORPORATION JP 1,518
  3. MAHLE INTERNATIONAL DE 1,120
  4. ALFA LAVAL SE 1,085
  5. HANON SYSTEMS KR 939
  6. DENSO CORPORATION JP 900
  7. LG ELECTRONICS KR 861
  8. HAMILTON SUNDSTRAND US 795
  9. DAIKIN INDUSTRIES JP 608
  10. DENSO CORPORATION 537