Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines

Introduced: September 1968

Title

Titles differ between systems:

IPC: Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibreboard production, on paper-making machines

CPC: Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines

Full titles differ between systems:

IPC:

Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibreboard production, on paper-making machines

CPC:

Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines

Of 10 combined children, 6 exist in both systems.

4 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

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D21F 11/002 CPC only CPC only
D21F 11/004 CPC only CPC only
D21F 11/006 CPC only CPC only
D21F 11/008 CPC only CPC only
D21F 11/02 of the Fourdrinier type IPC+CPC Available in IPC and CPC
D21F 11/06 of the cylinder type IPC+CPC Available in IPC and CPC
D21F 11/10 Making imitation mould-made paper IPC+CPC Available in IPC and CPC
D21F 11/12 Making corrugated paper or board IPC+CPC Available in IPC and CPC
D21F 11/14 Making cellulose wadding, filter or blotting paper +1 CPC IPC+CPC Available in IPC and CPC
D21F 11/16 Making paper strips for spinning or twisting IPC+CPC Available in IPC and CPC

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

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