Patent classifications
C
CHEMISTRY; METALLURGY
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C11
ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
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C11B
PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
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C11B9/0069
Heterocyclic compounds
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C11B9/0073
containing only O or S as heteroatoms
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C11B9/0076
the hetero rings containing less than six atoms
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