US PATENT SUBCLASS 552 / 240
.~.~.~ Oxygen 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}
238  DF  .~.~ Nitrogen bonded directly at alpha position (i.e., 1-, 4-, 5- or 8-position) {7}
240.~.~.~ Oxygen bonded directly at beta position (i.e., 2-, 3-, 6- or 7-position) {1}
241  DF  .~.~.~.~> Additional carbon bonded directly to the oxygen {1}

DEFINITION

Classification: 552/240

(under subclass 238) Compounds wherein a beta position (i.e., 2-, 3-, 6-, or 7- position) of the anthracene ring system has oxygen bonded directly thereto.

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