US PATENT SUBCLASS 552 / 201
.~.~ Two oxygens double bonded directly to the interior ring in para positions

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}
200  DF  .~ Tetracyclo naphthacene configured ring system having at least one double bond between ring members and having oxygen bonded directly to a carbon of an interior ring which carbon is a member of one ring only {2}
201.~.~ Two oxygens double bonded directly to the interior ring in para positions

DEFINITION

Classification: 552/201

(under subclass 200) Compounds wherein the interior ring, of the tetracyclo naphthacene configured ring system, has two oxygens double bonded directly thereto in para positions.

(1) Note. This subclass contains, for example: [figure]