Preparation

Introduced: September 1968

Full Title

Sulfur; Compounds thereof > Sulfur trioxide; Sulfuric acid > Preparation

Of 3 combined children, 2 exist in both systems.

1 codes are CPC-only extensions.

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C01B 17/745 CPC only CPC only
C01B 17/76 by contact processes +1 CPC IPC+CPC Available in IPC and CPC
C01B 17/82 of sulfuric acid using a nitrogen oxide process IPC+CPC Available in IPC and CPC