Patent classifications
C
CHEMISTRY; METALLURGY
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C10
PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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C10C
WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
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3/00
Working-up pitch, asphalt, bitumen
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C10C3/08
by selective extraction
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