Refining of pig-iron; Cast iron

Introduced: September 1968

IPC and CPC are identically structured here. All 5 subcodes exist in both systems.

1 shared codes have differing titles between IPC and CPC.

Child Classifications

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C21C 1/02 Dephosphorising or desulfurising +1 CPC IPC+CPC Available in IPC and CPC
C21C 1/04 Removing impurities other than carbon, phosphorus or sulfur IPC+CPC Available in IPC and CPC
C21C 1/06 Constructional features of mixers for pig-iron IPC+CPC Available in IPC and CPC
C21C 1/08 Manufacture of cast-iron IPC+CPC Available in IPC and CPC
C21C 1/10 Making spheroidal graphite cast-iron +1 CPC IPC+CPC Available in IPC and CPC

Class C21,2013–2023, worldwide · Source: EPO PATSTAT

Class C21,2013–2023, worldwide · Source: EPO PATSTAT