Selective elimination of impurities

Introduced: January 1980

Full Title

Full titles differ between systems:

IPC:

Phosphorus; Compounds thereof > Oxyacids of phosphorus; Salts thereof > Phosphoric acid > Purification; Stabilisation; Concentration > Selective elimination of impurities

CPC:

Phosphorus; Compounds thereof ( , C01B21/00, C01B23/00 take precedence; perphosphates C01B15/16) > Oxyacids of phosphorus; Salts thereof (peroxyacids or salts thereof C01B15/00) > Phosphoric acid > Purification; Stabilisation; Concentration (purification concomitant with preparation C01B25/22; preparation involving solvent-solvent extraction C01B25/46) > Selective elimination of impurities

Of 2 combined children, 1 exist in both systems.

1 codes are CPC-only extensions.

IPC defines codes here since 1980.

Child Classifications

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C01B 25/2372 +2 CPC CPC only CPC only
C01B 25/238 Cationic impurities since 1980 IPC+CPC Available in IPC and CPC