Patent classifications
C
CHEMISTRY; METALLURGY
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C08
ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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C08K
Use of inorganic or non-macromolecular organic substances as compounding ingredients
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C08K5/16
Nitrogen-containing compounds
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C08K5/34
Heterocyclic compounds having nitrogen in the ring
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C08K5/3467
having more than two nitrogen atoms in the ring
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C08K5/3475
condensed with carbocyclic rings
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