Patent classifications
C
CHEMISTRY; METALLURGY
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C07
ORGANIC CHEMISTRY
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C07C
ACYCLIC OR CARBOCYCLIC COMPOUNDS
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273/00
Preparation of urea or its derivatives, i.e. compounds containing any of the groups , the nitrogen atoms not being part of nitro or nitroso groups
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C07C273/02
of urea, its salts, complexes or addition compounds
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C07C273/14
Separation; Purification; Stabilisation; Use of additives
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