US PATENT SUBCLASS 556 / 447
.~.~.~ Two carbocyclic rings bonded directly to the oxygen

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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {3}
400  DF  .~ SILICON CONTAINING {19}
445  DF  .~.~ Two carbons bonded directly to the same oxygen {3}
447.~.~.~ Two carbocyclic rings bonded directly to the oxygen

DEFINITION

Classification: 556/447

(under subclass 445) Compounds in which the two carbons are ring members in carbocyclic rings.

(1) Note. An example of a compound provided for herein is: [figure]