US PATENT SUBCLASS 514 / 173
.~.~.~ Spiro ring system

Current as of: June, 1999
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514 /   HD   DRUG, BIO-AFFECTING AND BODY TREATING COMPOSITIONS

1  DF  DESIGNATED ORGANIC ACTIVE INGREDIENT CONTAINING (DOAI) {29}
169  DF  .~ Cyclopentanohydrophenanthrene ring system DOAI {5}
172  DF  .~.~ Hetero ring containing {4}
173.~.~.~ Spiro ring system

DEFINITION

Classification: 514/173

Spiro ring system:

(under subclass 172) Subject matter wherein a spiro ring is attached directly or indirectly to a carbon of the cyclopentanohydrophenanthrene nucleus.