DIFF Subgroup
B01J 21/06 Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
Introduced: July 1974
Full Title
Full titles differ between systems:
IPC:
Catalysts comprising the elements, oxides or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium or hafnium > Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
CPC:
Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium > Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
CPC subdivides this area 3x more granularly than IPC with 2 additional codes.
2 codes are CPC-only extensions.
IPC defines codes here since 1974.
Child Classifications
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