US PATENT SUBCLASS 585 / 25
.~.~ Plural rings

Current as of: June, 1999
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585 /   HD   CHEMISTRY OF HYDROCARBON COMPOUNDS

16  DF  COMPOUND OR REACTION PRODUCT MIXTURE {3}
24  DF  .~ Aromatic {1}
25.~.~ Plural rings {1}
26  DF  .~.~.~> Polycyclo, i.e., fused {1}

DEFINITION

Classification: 585/25

Plural rings:

(under subclass 24) Subject matter containing at least two rings, where at least one ring is an aromatic moiety.