US PATENT SUBCLASS 552 / 252
.~.~.~.~ Nitrogen or halogen bonded directly to the carbon (e.g., carboxamide bonded directly to the anthracene configured ring system, etc.)

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}
251  DF  .~.~.~ Carbon bonded directly to the anthracene configured ring system {1}
252.~.~.~.~ Nitrogen or halogen bonded directly to the carbon (e.g., carboxamide bonded directly to the anthracene configured ring system, etc.)

DEFINITION

Classification: 552/252

(under subclass 251) Compounds wherein the carbon has halogen or nitrogen bonded directly thereto.

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