DIFF Subgroup
C01B 32/21 After-treatment
Introduced: January 2017
Full Title
Full titles differ between systems:
IPC:
Carbon; Compounds thereof > Graphite > After-treatment
CPC:
Carbon; Compounds thereof (C01B21/00, C01B23/00 take precedence; percarbonates C01B15/10; carbon black C09C1/48) > Graphite > After-treatment
IPC and CPC are identically structured here. All 3 subcodes exist in both systems.
IPC defines codes here since 2017.
Child Classifications
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- C01B 32/215 Purification; Recovery or purification of graphite formed in iron making, e.g. kish graphite since 2017 IPC+CPC Available in IPC and CPC