C21D 9/0006 — IPC vs CPC Diff | Patent Classification Explorer

DIFF Subgroup

C21D 9/0006

Full Title

Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor

Of 3 combined children, 0 exist in both systems.

3 codes are CPC-only extensions.

This code exists only in CPC.

Diff view requires codes present in both systems.