US PATENT SUBCLASS 568 / 659
.~.~.~.~ 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}
579  DF  .~.~ Ethers {11}
626  DF  .~.~.~ Benzene ring containing {7}
659.~.~.~.~ Plural rings containing {2}
660  DF  .~.~.~.~.~> Polyoxy
661  DF  .~.~.~.~.~> Halogen containing

DEFINITION

Classification: 568/659

Plural rings containing:

(under subclass 626) Compounds which contain at least two rings.