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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C22B23/0415
with acids or salt solutions except ammonium salts solutions
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C22B23/0438
Nitric acids or salts thereof
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