US PATENT SUBCLASS 552 / 266
.~.~.~ Nitrogen, halogen or additional oxygen containing

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}
265  DF  .~.~ Carbon bonded directly at beta position (i.e., 2-, 3-, 6- or 7-position) {1}
266.~.~.~ Nitrogen, halogen or additional oxygen containing

DEFINITION

Classification: 552/266

(under subclass 265) Compounds which contain halogen, nitrogen or additional oxygen.

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