DIFF Subgroup
C21C 7/04 Removing impurities by adding a treating agent
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Treating molten ferrous alloys, e.g. steel, not covered by groups > Removing impurities by adding a treating agent
CPC:
Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 (treating molten metals during moulding B22D1/00, B22D27/00; remelting ferrous metals C22B) > Removing impurities by adding a treating agent
IPC and CPC are identically structured here. All 5 subcodes exist in both systems.
2 shared codes have differing titles between IPC and CPC.
Child Classifications
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- C21C 7/072 Treatment with gases (C21C7/06, C21C7/064, C21C7/068 take precedence) since 1980 IPC+CPC Available in IPC and CPC
- C21C 7/076 Use of slags or fluxes as treating agents (C21C7/06, C21C7/064, C21C7/068 take precedence) since 1980 IPC+CPC Available in IPC and CPC