Wet end of machines for making continuous webs of paper

Introduced: September 1968

Of 24 combined children, 20 exist in both systems.

4 codes are CPC-only extensions.

2 shared codes have differing titles between IPC and CPC.

Child Classifications

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D21F 1/0009 CPC only CPC only
D21F 1/0018 CPC only CPC only
D21F 1/0027 +5 CPC CPC only CPC only
D21F 1/009 CPC only CPC only
D21F 1/02 Head boxes of Fourdrinier machines +4 CPC IPC+CPC Available in IPC and CPC
D21F 1/04 Head boxes of cylinder machines +2 CPC IPC+CPC Available in IPC and CPC
D21F 1/06 Regulating pulp flow +1 CPC IPC+CPC Available in IPC and CPC
D21F 1/08 Regulating consistency IPC+CPC Available in IPC and CPC
D21F 1/10 Wire-cloths +1 CPC IPC+CPC Available in IPC and CPC
D21F 1/18 Shaking apparatus for wire-cloths and associated parts IPC+CPC Available in IPC and CPC
D21F 1/24 Tilting, raising, or lowering mechanisms for wire-cloths IPC+CPC Available in IPC and CPC
D21F 1/30 Protecting wire-cloths from mechanical damage IPC+CPC Available in IPC and CPC
D21F 1/32 Washing wire-cloths or felts +1 CPC IPC+CPC Available in IPC and CPC
D21F 1/34 Construction or arrangement of spraying pipes +1 CPC IPC+CPC Available in IPC and CPC
D21F 1/36 Guiding mechanisms +1 CPC IPC+CPC Available in IPC and CPC
D21F 1/44 Watermarking devices IPC+CPC Available in IPC and CPC
D21F 1/48 Suction apparatus (suction rolls D21F3/10) +1 CPC IPC+CPC Available in IPC and CPC
D21F 1/54 Skimming devices, e.g. froth ledges IPC+CPC Available in IPC and CPC
D21F 1/56 Deckle frame arrangements IPC+CPC Available in IPC and CPC
D21F 1/58 Deckle straps IPC+CPC Available in IPC and CPC

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

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