US PATENT SUBCLASS 568 / 325
.~.~.~.~ Plural rings containing


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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {4}
300  DF  .~ OXYGEN CONTAINING (E.G., PERCHLORYLBENZENE, ETC.) {11}
303  DF  .~.~ Ketones {10}
308  DF  .~.~.~ Benzene ring containing {3}
325.~.~.~.~ Plural rings containing {3}
326  DF  .~.~.~.~.~> Polycyclo ring system {1}
329  DF  .~.~.~.~.~> Alicyclic ring containing {1}
331  DF  .~.~.~.~.~> Carbonyl bonded directly to benzene ring {2}


DEFINITION

Classification: 568/325

(under subclass 308) Compounds which contain at least two rings.