Patent Classification Explorer PCE

DIFF Main Group

C21B 13/00

Making spongy iron or liquid steel, by direct processes

Introduced: September 1968

CPC subdivides this area 2x more granularly than IPC with 9 additional codes.

9 codes are CPC-only extensions.

Child Classifications

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C21B 13/0006 +2 CPC CPC only CPC only
C21B 13/0033 CPC only CPC only
C21B 13/004 CPC only CPC only
C21B 13/0046 +1 CPC CPC only CPC only
C21B 13/006 CPC only CPC only
C21B 13/0066 CPC only CPC only
C21B 13/0073 CPC only CPC only
C21B 13/008 CPC only CPC only
C21B 13/0086 +1 CPC CPC only CPC only
C21B 13/02 in shaft furnaces +2 CPC IPC+CPC Available in IPC and CPC
C21B 13/04 in retorts IPC+CPC Available in IPC and CPC
C21B 13/06 in multi-storied furnaces IPC+CPC Available in IPC and CPC
C21B 13/08 in rotary furnaces +1 CPC IPC+CPC Available in IPC and CPC
C21B 13/10 in hearth-type furnaces +1 CPC IPC+CPC Available in IPC and CPC
C21B 13/12 in electric furnaces +1 CPC IPC+CPC Available in IPC and CPC
C21B 13/14 Multi-stage processes +2 CPC IPC+CPC Available in IPC and CPC