US PATENT SUBCLASS 585 / 21
.~.~ Polycyclo, i.e., fused

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

16  DF  COMPOUND OR REACTION PRODUCT MIXTURE {3}
20  DF  .~ Alicyclic {2}
21.~.~ Polycyclo, i.e., fused {1}
22  DF  .~.~.~> Of differing carbon content, more than three or with bridge

DEFINITION

Classification: 585/21

Polycyclo, i.e., fused:

(under subclass 20) Subject matter which contains at least two rings which share two carbon atoms.