IPC Subgroup
C01B 21/38 Nitric acid
Introduced: September 1968
Last revised: January 2006
Full Title
Nitrogen; Compounds thereof > Nitrogen oxides; Oxyacids of nitrogen; Salts thereof > Nitric acid
Classification Context
- Section:
- CHEMISTRY; METALLURGY
- Class:
- INORGANIC CHEMISTRY
- Subclass:
- NON-METALLIC ELEMENTS; COMPOUNDS THEREOF
Related Keywords
NITRIC acid
4 direct subcodes
Child Classifications
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- C01B 21/4 Preparation by absorption of oxides of nitrogen
- C01B 21/42 Preparation from nitrates
- C01B 21/44 Concentration
- C01B 21/46 Purification; Separation