CPC Subgroup
C01B 21/20 Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
Full Title
Nitrogen; Compounds thereof > Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
9 direct subcodes
Child Classifications
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- C01B 21/22 Nitrous oxide (N2O)
- C01B 21/24 Nitric oxide (NO)
- C01B 21/34 Nitrogen trioxide (N2O3)
- C01B 21/36 Nitrogen dioxide (NO2, N2O4) ( , C01B21/26, C01B21/30 take precedence)
- C01B 21/38 Nitric acid
- C01B 21/48 Methods for the preparation of nitrates in general (particular individual nitrates, see the relevant groups of subclasses C01B - C01G, according to the cation)
- C01B 21/50 Nitrous acid; Salts thereof