Patent classifications
C
CHEMISTRY; METALLURGY
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C01
INORGANIC CHEMISTRY
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C01B
NON-METALLIC ELEMENTS; COMPOUNDS THEREOF;; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
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C01B17/48
Sulfur dioxide; Sulfurous acid
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C01B17/50
Preparation of sulfur dioxide
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C01B17/56
Separation; Purification
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