US PATENT SUBCLASS 514 / 174
.~.~.~ -O-C-O- is part of a hetero ring (e.g., acetonide, etc.)

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}
174.~.~.~ -O-C-O- is part of a hetero ring (e.g., acetonide, etc.)

DEFINITION

Classification: 514/174

-O-C-O- is part of a hetero ring (e.g., acetonide, etc.):

(under subclass 172) Subject matter wherein an -O-C-O- containing hetero ring is attached or fused to the cyclopentanohydrophenanthrene nucleus.