US PATENT SUBCLASS 552 / 282
.~.~ The polycyclo ring system has seven or eight cyclos

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}
282.~.~ The polycyclo ring system has seven or eight cyclos {1}
283  DF  .~.~.~> Halogen containing

DEFINITION

Classification: 552/282

(under subclass 271) Compounds wherein the anthracene configured ring system is part of a ring system composed of seven or eight cycles.

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