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CPC Subgroup
C09K 5/16

Materials undergoing chemical reactions when used

Full Title

Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion > Materials undergoing chemical reactions when used

Filing statistics

CPC C09K 5/16 belongs to the parent subclass C09K, which recorded 266,705 patent applications worldwide between 2013 and 2023. Annual filings grew from 18,457 in 2013 to 21,849 in 2023 (+18%), peaking at 28,968 applications in 2018. The most active applicants in class C09 are LG CHEM (7,954 applications), HALLIBURTON ENERGY SERVICES GROUP (6,584 applications) and NITTO DENKO CORPORATION (6,500 applications).

Source: EPO PATSTAT, worldwide filings

1 direct subcode

Child Classifications

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  • C09K 5/18 Non-reversible chemical reactions

Top Applicants

Top 10 applicants by patent filingsfor class C09, 2013–2023, worldwide · Source: EPO PATSTAT

  1. LG CHEM KR 7,954
  2. HALLIBURTON ENERGY SERVICES GROUP US 6,584
  3. NITTO DENKO CORPORATION JP 6,500
  4. 3M INNOVATIVE PROPERTIES COMPANY (MINNESOTA MINING AND MANUFACTURING INNOVATIVE PROPERTIES COMPANY) US 6,490
  5. DOW GLOBAL TECHNOLOGIES US 6,324
  6. FUJIFILM JP 5,832
  7. MERCK PATENT DE 5,481
  8. BASF (BADISCHE ANILIN & SODA FABRIK) DE 5,147
  9. SAMSUNG DISPLAY KR 5,105
  10. NITTO DENKO CORPORATION 3,584