Patent Classification Explorer PCE

DIFF Main Group

C22B 34/00

Obtaining refractory metals

Introduced: July 1974

IPC and CPC are identically structured here. All 3 subcodes exist in both systems.

IPC defines codes here since 1974.

Child Classifications

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C22B 34/10 Obtaining titanium, zirconium or hafnium since 1974 IPC+CPC Available in IPC and CPC
C22B 34/20 Obtaining niobium, tantalum or vanadium since 1974 IPC+CPC Available in IPC and CPC
C22B 34/30 Obtaining chromium, molybdenum or tungsten since 1974 IPC+CPC Available in IPC and CPC