US PATENT SUBCLASS 552 / 224
.~.~.~ Carbonyl, nitrogen, oxygen or halogen bonded directly at beta position (i.e., 2-, 3-, 6- or 7-position)

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}
208  DF  .~ Polycyclo ring system containing anthracene configured ring system having at least one double bond between ring members and having oxygen single bonded or any atom double bonded directly at the 9- and 10-positions (e.g., anthraquinones, etc.) {19}
221  DF  .~.~ Sulfur bonded directly at beta position (i.e., 2-, 3-, 6- or 7-position) {4}
224.~.~.~ Carbonyl, nitrogen, oxygen or halogen bonded directly at beta position (i.e., 2-, 3-, 6- or 7-position)

DEFINITION

Classification: 552/224

(under subclass 221) Compounds wherein a beta position (i.e., 2-, 3-, 6- or 7- position) of the anthracene configured ring system has halogen, oxygen, nitrogen or carbonyl bonded directly thereto.

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