CPC Subgroup
C01B 32/28 After-treatment, e.g. purification, irradiation, separation or recovery
Full Title
Carbon; Compounds thereof (C01B21/00, C01B23/00 take precedence; percarbonates C01B15/10; carbon black C09C1/48) > Diamond > After-treatment, e.g. purification, irradiation, separation or recovery