IPC Subgroup
C01B 25/237 Selective elimination of impurities
Introduced: January 1980
Last revised: January 2006
Full Title
Phosphorus; Compounds thereof > Oxyacids of phosphorus; Salts thereof > Phosphoric acid > Purification; Stabilisation; Concentration > Selective elimination of impurities
Classification Context
- Section:
- CHEMISTRY; METALLURGY
- Class:
- INORGANIC CHEMISTRY
- Subclass:
- NON-METALLIC ELEMENTS; COMPOUNDS THEREOF
1 direct subcode
Child Classifications
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- C01B 25/238 Cationic impurities