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
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use



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]