Patent classifications
C
CHEMISTRY; METALLURGY
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C22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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C22B
PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
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C22B11/021
Recovery of noble metals from waste materials
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C22B11/025
from manufactured products, e.g. from printed circuit boards, from photographic films, paper, or baths
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