US PATENT SUBCLASS 552 / 200
.~ 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

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.~ 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  DF  .~.~> Two oxygens double bonded directly to the interior ring in para positions
202  DF  .~.~> At least six oxygens bonded directly to the tetracyclo ring system {1}

DEFINITION

Classification: 552/200

(under subclass 1) Compounds under Class 532, ... having the tetracyclo naphthacene ring configuration with at least one double bond between ring members and having oxygen bonded directly to a carbon of an interior ring, of the ring system, which carbon is a member of one ring only.

(1) Note. The tetracyclo naphthacene configured ring is numbered as follows, for this subclass and its indents: [figure]

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