After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters

Introduced: September 1968

Of 6 combined children, 4 exist in both systems.

2 codes are CPC-only extensions.

2 shared codes have differing titles between IPC and CPC.

Child Classifications

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D21C 9/001 +2 CPC CPC only CPC only
D21C 9/008 CPC only CPC only
D21C 9/02 Washing IPC+CPC Available in IPC and CPC
D21C 9/08 Removal of fats, resins, pitch or waxes; +2 CPC IPC+CPC Available in IPC and CPC
D21C 9/10 Bleaching +11 CPC IPC+CPC Available in IPC and CPC
D21C 9/18 De-watering (de-watering in general F26B); (D21C9/002, D21C9/02 take precedence; paper-making machines D21F; strainers in digesters D21C7/00; presses in general B30B) +1 CPC IPC+CPC Available in IPC and CPC

Class D21,2013–2023, worldwide · Source: EPO PATSTAT

Class D21,2013–2023, worldwide · Source: EPO PATSTAT