US PATENT SUBCLASS 552 / 615
.~.~.~ Oxygen bonded directly at the 5-, 6- or 7-position

Current as of: June, 1999
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552 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, subclass 1) {11}
502  DF  .~ Cyclopentanohydrophenanthrene ring system containing {21}
612  DF  .~.~ Three or more oxygens bonded directly to the cyclopentanohydrophenanthrene ring system {6}
615.~.~.~ Oxygen bonded directly at the 5-, 6- or 7-position

DEFINITION

Classification: 552/615

(under subclass 612) Compounds wherein oxygen is bonded directly at the 5-,6- or 7-position of the cyclopentanohydrophenanthrene ring system.