DIFF Subgroup
C01B 33/021 Preparation (chemical coating from the vapour phase C23C16/00)
Introduced: January 1990
Title
Titles differ between systems:
IPC: Preparation
CPC: Preparation (chemical coating from the vapour phase C23C16/00)
Full Title
Full titles differ between systems:
IPC:
Silicon; Compounds thereof > Silicon > Preparation
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)
IPC and CPC are identically structured here. All 2 subcodes exist in both systems.
IPC defines codes here since 1990.
Child Classifications
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- C01B 33/023 by reduction of silica or silica-containing material since 1990 IPC+CPC Available in IPC and CPC
- C01B 33/027 by decomposition or reduction of gaseous or vaporised silicon compounds other than silica or silica-containing material since 1990 IPC+CPC Available in IPC and CPC