Bleaching

Introduced: September 1968

Full Title

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

CPC subdivides this area 5x more granularly than IPC with 11 additional codes.

11 codes are CPC-only extensions.

2 shared codes have differing titles between IPC and CPC.

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D21C 9/1005 CPC only CPC only
D21C 9/101 CPC only CPC only
D21C 9/1015 CPC only CPC only
D21C 9/1021 CPC only CPC only
D21C 9/1026 +5 CPC CPC only CPC only
D21C 9/1057 CPC only CPC only
D21C 9/1063 CPC only CPC only
D21C 9/1068 CPC only CPC only
D21C 9/1073 CPC only CPC only
D21C 9/1078 CPC only CPC only
D21C 9/1084 +2 CPC CPC only CPC only
D21C 9/12 with halogens or halogen-containing compounds (D21C9/16 takes precedence) +2 CPC IPC+CPC Available in IPC and CPC
D21C 9/147 with oxygen or its allotropic modifications (D21C9/16 takes precedence) since 1985 IPC+CPC Available in IPC and CPC
D21C 9/16 with per compounds +2 CPC IPC+CPC Available in IPC and CPC

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

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