DIFF Subgroup
C01B 17/78 characterised by the catalyst used
Introduced: September 1968
Full Title
Sulfur; Compounds thereof > Sulfur trioxide; Sulfuric acid > Preparation > by contact processes > characterised by the catalyst used
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
IPC defines codes here since 1980.
Child Classifications
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