US PATENT SUBCLASS 552 / 290
.~.~ Carbon, halogen or plural oxygens bonded directly to the anthracene configured ring system

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}
271  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 direct at the 9- or 10-position (e.g., anthrones, anthranois, etc.) {10}
290.~.~ Carbon, halogen or plural oxygens bonded directly to the anthracene configured ring system

DEFINITION

Classification: 552/290

(under subclass 271) Compounds wherein the anthracene configured ring system has halogen, carbon or plural oxygens bonded directly thereto.

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