IPC Subgroup
C22B 34/3 Obtaining chromium, molybdenum or tungsten
Introduced: July 1974
Last revised: January 2006
Full Title
Obtaining refractory metals > Obtaining chromium, molybdenum or tungsten
Classification Context
- Section:
- CHEMISTRY; METALLURGY
- Class:
- METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- Subclass:
- PRODUCTION OR REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
3 direct subcodes
Child Classifications
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- C22B 34/32 Obtaining chromium
- C22B 34/34 Obtaining molybdenum
- C22B 34/36 Obtaining tungsten