characterised by function or properties in or on the paper (D21H19/66, D21H27/02 take precedence)

Child Classifications

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• D21H 21/143 CPC only CPC only
• D21H 21/146 CPC only CPC only
• D21H 21/16 Sizing or water-repelling agents since 1990 IPC+CPC Available in IPC and CPC
• D21H 21/18 Reinforcing agents since 1990 IPC+CPC Available in IPC and CPC
• D21H 21/22 Agents rendering paper porous, absorbent or bulky since 1990 IPC+CPC Available in IPC and CPC
• D21H 21/26 Agents rendering paper transparent or translucent since 1990 IPC+CPC Available in IPC and CPC
• D21H 21/28 Colorants since 1990 +1 CPC IPC+CPC Available in IPC and CPC
• D21H 21/30 Luminescent or fluorescent substances, e.g. for optical bleaching (D21H21/40 takes precedence) since 1990 IPC+CPC Available in IPC and CPC
• D21H 21/32 Bleaching agents (bleaching cellulose pulp D21C9/10) since 1990 IPC+CPC Available in IPC and CPC
• D21H 21/34 Ignifugeants since 1990 IPC+CPC Available in IPC and CPC
• D21H 21/36 Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents since 1990 IPC+CPC Available in IPC and CPC
• D21H 21/38 Corrosion-inhibiting agents or anti-oxidants since 1990 IPC+CPC Available in IPC and CPC
• D21H 21/40 Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper (watermarking B41M3/10, D21F1/44; security printing B41M3/14; securities or banknotes characterised by colour effects B42D25/29, B42D25/30; testing paper currency or valuable papers for genuineness G07D7/00) since 1990 IPC+CPC Available in IPC and CPC