Patent classifications
C
CHEMISTRY; METALLURGY
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C21
METALLURGY OF IRON
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C21B
MANUFACTURE OF IRON OR STEEL
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13/00
Making spongy iron or liquid steel, by direct processes
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C21B13/0006
obtaining iron or steel in a molten state
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C21B13/0013
introduction of iron oxide into a bath of molten iron containing a carbon reductant
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