DIFF Subgroup
C09K 5/16 Materials undergoing chemical reactions when used
Introduced: January 2000
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
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
IPC defines codes here since 2000.
Child Classifications
Navigate with arrow keys, Enter to open
Top Applicants
Top Applicants (IPC)
Class C09,2013–2023, worldwide · Source: EPO PATSTAT
- LG CHEM KR 6,420
- NITTO DENKO CORPORATION JP 5,752
- HALLIBURTON ENERGY SERVICES GROUP US 5,650
- 3M INNOVATIVE PROPERTIES COMPANY (MINNESOTA MINING AND MANUFACTURING INNOVATIVE PROPERTIES COMPANY) US 5,635
- DOW GLOBAL TECHNOLOGIES US 4,844
- MERCK PATENT DE 4,779
- CHINESE ACADEMY OF SCIENCES 4,311
- FUJIFILM JP 4,205
- BASF (BADISCHE ANILIN & SODA FABRIK) DE 4,039
- SINOPEC (CHINA PETROCHEMICAL CORPORATION) 3,931
Top Applicants (CPC)
Class C09,2013–2023, worldwide · Source: EPO PATSTAT
- LG CHEM KR 7,954
- HALLIBURTON ENERGY SERVICES GROUP US 6,584
- NITTO DENKO CORPORATION JP 6,500
- 3M INNOVATIVE PROPERTIES COMPANY (MINNESOTA MINING AND MANUFACTURING INNOVATIVE PROPERTIES COMPANY) US 6,490
- DOW GLOBAL TECHNOLOGIES US 6,324
- FUJIFILM JP 5,832
- MERCK PATENT DE 5,481
- BASF (BADISCHE ANILIN & SODA FABRIK) DE 5,147
- SAMSUNG DISPLAY KR 5,105
- NITTO DENKO CORPORATION 3,584