IPC Subgroup
C01B 17/74 Preparation
Introduced: September 1968
Last revised: January 2006
Full Title
Sulfur; Compounds thereof > Sulfur trioxide; Sulfuric acid > Preparation
Classification Context
- Section:
- CHEMISTRY; METALLURGY
- Class:
- INORGANIC CHEMISTRY
- Subclass:
- NON-METALLIC ELEMENTS; COMPOUNDS THEREOF
2 direct subcodes
Child Classifications
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- C01B 17/76 by contact processes
- C01B 17/82 of sulfuric acid using a nitrogen oxide process