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PCE
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DIFF Subgroup
C01B 33/023

by reduction of silica or silica-containing material

Introduced: January 1990

Full Title

Full titles differ between systems:

IPC:

Silicon; Compounds thereof > Silicon > Preparation > by reduction of silica or silica-containing material

CPC:

Silicon; Compounds thereof ( C01B21/00, C01B23/00 take precedence; persilicates C01B15/14; carbides C01B32/956) > Silicon (forming single crystals or homogeneous polycrystalline material with defined structure C30B) > Preparation (chemical coating from the vapour phase C23C16/00) > by reduction of silica or silica-containing material

IPC and CPC are identically structured here. All 1 subcodes exist in both systems.

IPC defines codes here since 1990.

Child Classifications

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  • C01B 33/025 with carbon or a solid carbonaceous material, i.e. carbo-thermal process since 1990 IPC+CPC Available in IPC and CPC