DIFF Subgroup
B01J 21/14 Silica and magnesia
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 > Silica and magnesia
CPC:
Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium > Silica and magnesia
No child classifications to compare. This is a leaf node in both IPC and CPC.