CPC Main Group
C01B 13/00 Oxygen; Ozone; Oxides or hydroxides in general
3 direct subcodes
Child Classifications
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- C01B 13/02 Preparation of oxygen (by liquefying F25J)
- C01B 13/10 Preparation of ozone
- C01B 13/14 Methods for preparing oxides or hydroxides in general (particular individual oxides or hydroxides, see the relevant groups of subclasses C01B - C01G or C25B, according to the element combined with the oxygen or hydroxy group)