DIFF Subgroup
C01B 33/113 Silicon oxides; Hydrates thereof
Introduced: January 1980
Full Title
Full titles differ between systems:
IPC:
Silicon; Compounds thereof > Silicon oxides; Hydrates thereof
CPC:
Silicon; Compounds thereof ( C01B21/00, C01B23/00 take precedence; persilicates C01B15/14; carbides C01B32/956) > Silicon oxides; Hydrates thereof
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
Child Classifications
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- C01B 33/12 Silica; Hydrates thereof, e.g. lepidoic silicic acid +3 CPC IPC+CPC Available in IPC and CPC